the bears seem genuinely interested in playing. they had a look of focus on the puck as it slid by them, following it with their eyes. it triggered some sort of instinctive behavior and they don't seem threatened at all. don't you think even through the smallest of animal observations there could be an underlying thing to see humans as fascinating? i don't see the reason to get worried about abuse when we're talking about a game.
it's just like any circus animal, though. I feel bad for them in that way.