It’s common courtesy really. I don’t know why anyone would think it polite to interrupt a guy in the middle of a game. If he were playing a jrpg, ok, sure, you tell him, “Hey, you need to find a save point because shit’s on fire.” Most games these days feature the auto save pretty heavily, so you might be ok there too, so let’s assume this guy is in the middle of some heavy shit. Maybe he’s fighting whatever is difficult in Skyrim. Or in the middle of a fucking check point race in Twisted Metal. Fuck, I and everything around me could be consumed in fucking fire, and I would not interrupt a man who controlled water itself if he were doing well in that fucking checkpoint race. Fuck!