for me, saying no rusdh is basicly saying give up 1/4 of the shit you practiced for. Me and my friend had won so many times when we ling rushed and teched up to mutas or lurkers. We had microed so well with them that it wasnt even funny. So when the opponent is a newb and says no rush, and almost forces me to rush.(not that im always zerg, im just zerg when my friend is, cuz we work out supreme combo)