Basicly RCC is recover crouch cancel. you can recover any move that leaves you in crouch by tapping a direction, the easiest way for me is iMCF tap 6 then immediatly in put another iMCF... He should basicly do one iMCF then blink right after it and do another without even moving... My vid on youtube SC4 tips or whatever has me doing it 5 times in a row at the end.