but everyone starts the video at the same place if ur avg is 52 seconds good chance they left at the 52 second mark. maybe some skimmed thru but it seems like something at the spot made people lose interest

look:
at 40sec mark 56%of viewers still watching
at 36sec mark 54%of viewers still watching
This is how people watch videos:
start video
fast scan video, when its playing
scroll the timeline and watch what looks interesting