My spouse used to be a work comp underwriter. One client had a guy who did not like his job review, got a gun, and proceeded to pop a cap in his boss & the bosses boss. Guess of those three who was the first to fire a work comp claim AND GET PAID! The guy with the gun.
"The Pizza Hut employee should file a work comp claim with Pizza Hut. PH screwed him big time by firing him."
Not saying whether I agree or disagree on principal, but Indiana is an employment-at-will state. Your employer can fire you if they don't like the color shirt you are wearing, and you basically have no recourse. The only exception would be if you could prove discrimination based on a protected class (e.g. sex or race). Pizza Hut may or may not be morally culpable depending on your perspective, but they did nothing wrong legally.
(Personally, I think Pizza Hut should give him an Employee of the Month award).