What it says: No, ignoring Dandy 3 or 4 times does not guarantee that Twisted Dandy will spawn, as it only introduces a growing random chance. First 3 skipped shops: Dandy becomes angry, and Twisted Dandy gets a 20% chance to spawn. Subsequent skips: The spawn percentage increases with every extra shop you ignore. You must ignore Dandy's shop 5 times in a row after he gets angry (totaling 8 consecutive skipped shop appearances) to guarantee Twisted Dandy spawns on the next floor.
