In addition to all the things that UH said, in UK contests we typically
have a pilot safety committee. This is 3 competitors deemed to be respected
and experienced, often senior instructors, and approved by a simple show of
hands at the beginning of the contest. Any issue like this can be brought
to their attention and the matter of genuine mistakes or safety concerns
can generally be resolved by chat and peer review. Normally a quiet, "mind
how you both go," works wonders all round and everybody learns from the
experience. Anything that turns out to be really bad can be escalated to
the comp organisers for possible penalty or official warning etc.

Personally I dislike folks barreling in to an established thermal and
causing me to take some precautionary action as you chose to do. As Jim
says, the other guy's flarm would have warned him about you and I think he
could have made a bit more effort on this occasion.

Martin N5