Quote (Marieusz @ Feb 13 2017 09:10pm)
What is probably happening is his Conviction aura is activated on you before you switch back to yours from the Life Tap wand so his Convcition is applying and yours isn't, quite a lot of people don't know about this mechanic
This.
Higher level conviction overrides a lower level one. The catch is you have to have your higher level one on before you get in range of his. So if you theoretically put on conviction when you went into Trist, then walked around to him, when he came into range, yours would override his. If you did that, but swapped to lifetap (and dropped your conviction in the process), his is now no longer overridden, even when you swap back to yours, despite what the LCS says.
tl;dr, don't rely on conviction aura to override his. If you are doing it this way anyway, put your conviction on well before you see him, and do NOT take it off until he's dead.