Kermit :
I do know of an accident in the UK some years ago, although I can't find the accident report on the AAIB web site.
Essentially, an S61 in a hover-taxi at heavy weights disturbed the ar so much that a light aircraft which encountered the downwash was overturned, with fatal results.
It is at least a courtesy thing for small helicopter pilots to avoid incidents such as yours which, while upsetting, don't have the potential to cause problems as above.