Regulator ^^
Ah, another insightful comment that illustrates your failed education.
According to your logic, the only thing that motivates any creature is the act of being offended. Perhaps the tiger felt threatened by the border-jumping assholes that were taunting it and act all bad ass. Now, I'm no animal psychologist, but I bet that there is a very likely cause - effect going on here with the Tiger and three, errr two, assholes.
Perhaps you could test your theory by taking a trip to your local zoo (don't worry, I'll pick up the costs if you live).... find a lion or tiger exhibit.... lean over the protective fencing and act fierce but only shout complimentary and respectful comments to the animal. Bear your teeth, act like your normal, dumb self, flail your arms, scream (respectfully, mind you), then check back with the swarm.
Good luck.