The Walleye players were dressed in Batman jerseys, while the Icemen countered with uniforms resembling the Riddler. This event was intended to commemorate the 75th anniversary of Batman's presence in comic books.
Late in the third period, these opposing skaters, perhaps channelling the characteristics of the rival superheroes, decided to drop the gloves.
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It could also just be that tempers had boiled over as they often do in a blowout. Toledo was in front 6-1 at the time.
No word on whether these particular jerseys had any increased value in the charitable auction following the game.