You can tell that the speaker himself gets defensive when asked a question he doesn't like, and uses the copout "couldn't hear you" "echoes" in an attempt to shame or weaken the speakers confidence upon second delivery of their question.
Minute 25 he talks about how it's proven that Jesus didn't return. 1844 the declaration of the Bab signaled the second coming of Christ, Bahá'u'lláh was the return of Christ.
Bahá'u'lláh's time in the garden of Ridván in 1863 and his announcement that he was the prophet promised by the Báb.
The martyrdom of the Báb: On the morning of July 9, 1850 in Tabriz, a 30-year-old Persian merchant known as the Báb was charged with apostasy and shot by order of the Prime Minister of the Persian Empire. The Báb and His disciple were suspended by ropes from a nail in the wall, the head of Mirza Muhammad-'Ali resting on the breast of the Báb. Seven hundred and fifty soldiers were positioned in three files. Roofs of the buildings around teemed with spectators.
Each row of soldiers fired in turn. The smoke from so many rifles clouded the scene. When it lifted the Báb was not there. Only His disciple could be seen, standing under the nail in the wall, smiling and unconcerned. Bullets had only severed the ropes with which they were suspended. Cries rang out from the onlookers: 'The Siyyid-i-Báb has gone from our sight!'
A frantic search followed. The Báb was found, sitting in the same room where He had been lodged the night before, in conversation with His amanuensis. That conversation had been interrupted earlier in the day. Now it was finished and He told the farrash-bashi to carry out his duty. But the farrash-bashi was terror-stricken and ran away, nor did he ever return to his post. Sam Khan, for his part, told his superiors that he had carried out the task given to him; he would not attempt it a second time. So Aqa Jan Khan-i-Khamsih and his Nasiri regiment replaced the Armenians, and the Báb and His disciple were suspended once again at the same spot. The Nasiri regiment fired. The bodies of the Báb and His disciple were shattered, and their flesh was united.
These events were witnessed by western journalists. Provided below is one source that is attributed to Sir Justin Sheil, Queen Victoria's Envoy Extraordinary and Minister Plenipotentiary in Tehran and written to Lord Palmerston, the British Secretary of State for Foreign Affairs, July 22, 1850.[8][9]
The founder of the sect has been executed at Tabreez. He was killed by a volley of musketry, and his death was on the point of giving his religion a lustre which would have largely increased his proselytes. When the smoke and dust cleared away after the volley, Báb was not to be seen, and the populace proclaimed that he had ascended to the skies. The balls had broken the ropes by which he was bound, but he was dragged from the recess where after some search he was discovered and shot. His death, according to the belief of his disciples, will make no difference as Báb must always exist.
— Sir Justin Sheil
Queen Victoria herself wrote letters back to Bahá'u'lláh (another matter entirely)
Question: Will you explain the subject of Return? (essentially the talking point that the speaker claims is proven to be false)
Answer: Baha’u’llah has set forth a lengthy and detailed explanation of this matter in [The Book of Certitude]. Read it, and the truth of this matter will become clear and manifest.
In the Gospel it is recorded therein that when John the son of Zacharias appeared and announced unto the people the advent of the Kingdom of God, they asked him, “Who art thou? Art thou the promised Messiah?” He replied, “I am not the Messiah.” They then asked him, “Art thou Elias?” He replied, “I am not.” John 1:19–21 These words clearly establish that John the son of Zacharias was not the promised Elias.
But on the day of the transfiguration on Mount Tabor, Christ explicitly said that John the son of Zacharias was the promised Elias. In Mark 9:11 it is said: “And they asked Him, saying, Why say the scribes that Elias must first come? And He answered and told them, Elias verily cometh first, and restoreth all things; and how it is written of the Son of man, that He must suffer many things, and be set at naught. But I say unto you, That Elias is indeed come, and they have done unto him whatsoever they listed, as it is written of him.” And in Matthew 17:13 it is said: “Then the disciples understood that He spake unto them of John the Baptist.”
Now, they asked John the Baptist, “Art thou Elias?” and he answered, “I am not”, whereas it is said in the Gospel that John was the promised Elias himself, and Christ clearly stated this as well. If John was Elias, why did he say he was not, and if he was not Elias, why did Christ say he was?
The reason is that we consider here not the individuality of the person but the reality of his perfections—that is to say, the very same perfections that Elias possessed were realized in John the Baptist as well. Thus John the Baptist was the promised Elias. What is being considered here is not the essence but the attributes.
John the Baptist was asked three distinct questions:
Question (and Answer) #1:
And this is the record of John, when the Jews sent priests and Levites from Jerusalem to ask him, Who art thou? And he confessed, and denied not; but confessed, I am not the Christ. - John 1:19–20.
Question (and Answer) #2:
And they asked him, What then? Art thou Elias? And he saith, I am not.” - John 1:21a.
Question (and Answer) #3:
Art thou that prophet? And he answered, No. … And they asked him, and said unto him, Why baptizest thou then, if thou be not that Christ, nor Elias, neither that prophet?” - John 1:21b, 25.
These three questions, two of which are mentioned by Abdu’l-Baha in the passage above, arise from the expectation, at the time of Christ, not of one Messiah, but of three messiahs: (1) the messianic King (a ruler like King David); (2) the messianic priest (return of Elijah); (3) and the messianic prophet (the return of Moses).
So, to sum up, the Baha’i teachings offer a new understanding of the “return” of Christ. It's not a literal return of Jesus Christ. Why? Because that would be reincarnation — a doctrine foreign to Christianity, historically and doctrinally.
Just as John the Baptist, according to the Bible itself, would come “in the spirit and power of Elias” (Luke 1:17), so Baha’u’llah has come in “in the spirit and power” of Jesus Christ.