Similar thing happened in 85 at Crossmaglen where the mortars came in over the fence as the Wessex was in the hover - the crewman saw one coming and shouted a warning. The captain grabbed a handful of lever and as it climbed one of the bombs rolled under the aircraft and went off blowing the windows in. Walter still flew away, much to the chagrin of the boyos who must have thought they really had one that day.