[Trexmaster]

It's probably due to the number of monsters being random, so, I think it always activates. I can't recall if we ever encountered only two monsters. We just happened to do gear-swaps at bad times, I guess.

Also it appears crazy dungeons only get 1-2 monsters extra at most (seeing as the highest result I've witnessed was 11.)

I'll do more testing once I can get my hands on more bloodsoaked weapons.