LemLemsAnd lo I did, indeed do a silly thing (tried my usual practice of tackling Ansur at level 10 because I’m passing through Wyrms Rock anyway so why not grab the loot as well).
Managed to avoid it ending my #HonourMode run - just - by deploying the martial art of running away.
The annoying thing is that I had him down to about 100HP, i was sorely tempted to try to win it. But I’m sure that would’ve ended the run - 2 of my party were dead and another was down.