So, uh, this one is kind of hard to fathom.
But, teammates face off against each other at the World Championship as was the case for Giroux (representing Canada) vs. Gudas and the Czech Republic. Thus, we have the violent defenseman dropping the Flyers scoring star with one punch while he also intimidates Nathan MacKinnon in a clip you really have to see to believe.
CSN Philly provided that video. More on that here.
Canada ended up winning the game 4-1. Giroux and Jakub Voracek seemed a lot friendlier.