1st one I ever did was out of Jet Ranger. We rehearsed over and over so that there would not be a dramtic CG shift from one side. Had comms and evertything and they still did their own thing. Three guys bailed on the right side, leaving myself and the jumpmaster sitting behind me.
Got very sporty for a few seconds.
Did it later out if a UH1 and 212, not as much of an issue, but communication and a good jumpmaster is key!