Do you think the Lion Witness knows what the tiger did with the 4th young man?
Hypothesis: Four punks. One has slingshot and annoys the tiger. Tiger gets out. He mauls the closest kid, and the other three take off, two in one direction, one in the opposite direction. Tiger finishes explaining how annoyed she is with the first punk, catches the scent of the other three punks, goes in direction that two of them went, letting the third third get away scot free. Third one is the one carrying the slingshot.
Just a hypothesis, but if it happened this way, punk #4 has no motivation to come forward.