Grzegorz is the star that barely understands English, so fighting another star who also barely speaks English requires some innovative communication. Fortunately, obscene gestures are more or less universal, and angry shouting in Polish is some of the most terrifying sounds that can be produced by a human not named Kendrick Lamar. Being a goalie also makes this somewhat easier: goalies do not fight skaters, so his only option is a goalie fight, and there are only so many reasons for a goalie to shake off his gloves and skate to center ice during a line brawl. Accompany this with some good old fashioned gesticulation and Slavic screaming, and the opposing goalie will have a difficult time misunderstanding the situation. What happens thereafter is anyone's guess. The refs are typically lamers who don't let goalies fight, so it'll take enough of a line brawl to distract all four zebras at once for this to even be possible. Grzegorz has a healthy hooligan streak, so the opposing goalie better come ready to play.