I should have put that stepping off on beats 1.2 in a 4/4 Tango will have you at the end of your Closed Promenade dancing 3/4 1 2 instead of 1 2 3 4. on your Reverse Turn which might follow. The best way is to try it and see. If you need to let two beats go . Just do a Head Flick or simply stand still.