I'm with some of the rest of you, I would guess the kid was provoking the loose tiger. I don't feel too sorry for him.
No it is not a guess, witnesses report that the very same 3 men who were attacked were taunting and teasing the tiger while it was in its pen, not loose.
The tiger couldn't take it anymore and showed a display of acrobatics that none previously had. It leaped over a large moat, and then up a good 12 foot or so ledge and attacked one of them, killing him.
The tiger ignored other people close to it and then proceeded to stalk the other 2 who had been a part of the 3 man teasing group, as it went around other bystanders without harming them.
It then caught up with them and delivered what it felt was vengeance.
They were found 300 yards from the spot of the first guy.
Police eventualy arrived to find the tiger merely sitting next to one of them. It had not killed him and was no longer trying, keep in mind this is a domestic tiger, think big cat with toy mouse that it was upset with.
Then when the police arrived the tiger realized its time to toy with/retaliate against the person was about to come to an end and it went to the victim to attack him again.
When police approached the tiger realized they were a threat and gave its attention to them at which time they realized they were in danger and opened fire.
All around a tragic situation. Some immature teens were harassing a tiger and the tiger was able to get loose and be a tiger. Human life was lost, and the tiger was put down.