Sat in a hot debrief with a Tornado crew many years ago when I was a Puma Crewman and they said that they would not normally waste munitions on a Rotary target but on an opportunity basis on the way home they would certainly send something down if it was still on a pylon.
Can't remember the specifics from my HTI days but some of those bombs put up a very large amount of crap and corruption which travelling in all directions way way quicker that the heli it was aimed at and is one of the tactics the Tornado guys talked about using
