Forgive me if this has allready been mentioned but,
Although it has not happened to me (in 4000 hours in R22s) it is not unheard of of the old engine to cut in the flare(during a quickstop). Expecially if you have not been religious with the carb heat!!!
Going sideways at this point just seems bloody stupid!!!
If a "sideways quickstop" stops you a little quicker, and you need this technique to avoid hitting something, then why were you there in the first place.
I think there is more "showing off" involved here then operational necessity.