User blog comment:Rapture's Daddy/A fairy in Bioshock Infinite trailer?/@comment-2144431-20100817140835

There's no way its a leaf, for one, its behind Elizabeth so it won't be affected by telekinesis, it hovers as well, the whispering stops when it dissappears and when it falls it goes down in a diagonal line, if it was a leaf it would swayed and would have been all over the place.