A Qun thing. [ this isn't exactly on tony stark's alley. still, he can understand it even without the longwinded explanation. ]
Most people don't invite making new ones. [ no matter how many they have. there's still that instinct that pulls you back, tries to keep you from getting yourself wrecked. tony knows it well bc he overrides it constantly. but he also knows from this that it doesn't go away, not ever. ]