It sounds like a really offal moment, one minute you are on the rump of a hill, sitting on the topside, and looking forward to descending at a brisket pace.
Then some clod pushing their luck, legs it out of a field, sticks their neck out, pulls a flanker and chucks a spanner in the works
Could have been worse, look on the silverside, and try and develop a ribald sense of humour.