and the handfuls of fish they're getting delivered by the trainer are all getting smaller. so they know that they're coming down to the end of session. >> when you see the difference between the beginning of the video and the end of the video, you can see that he's just not quite on his game anymore. >> there's no food left. she kept asking him for more and more behaviors. he wasn't getting reinforced for the behaviors that he was doing correctly. he probably was frustrated towards the end. >> then she walked around the perimeter of "g" pool. he followed her. and then continued over into the rocky ledge area where she laid down with him to do a relationship session, which is quiet time basically. >> tilikum at some point grabbed ahold of her left forearm and started to drag her and eventually did a barrel roll and pulled her in. may have started as play or