Lot's of speculative remarks on the linked page. I doubt none of them saw the entire game. I didn't either.
I do know this can happen whenever the refs lose control of the game (e.g. call fouls inconsistently or not at all). Seems like there were a lot of fouls called on the Hoyas; don't know if they were justified or not.
If the GT players were playing extraordinarily rough, then the other team eventually retaliates.
If the calls were disproportionately against the GT players, that's going to precipitate some hard feelings too.
It happens between all combinations of teams as well, US, Europe, etc. In fact, ANY competitive sport.
A 5 second youtube search comes up with all kinds of examples:
...... Sorry. I got diverted by the cat fight videos.
Sherwood