As far as the 'tiger attack in Vegas', I am assuming that you were referring to the 'attack' on Roy Horn by his stagemate, Manticore? What appears to have happened, and is strongly supported by Horn himself, is that the tiger got nervous when Horn fell, felt that Horn was in danger, and attempted to drag him offstage.....grabbing him by the 'scruff' the way a parent felid would grab a baby....but in this case, Horn's neck being considerably less resilient than a tigers....you get the picture.
G. A. Christian Bilou, Herpetologist
Founder/Director, Reptile Rescue Alberta
Past-President, Calgary Aquarium Society