I was going through the list of flags 1, 2, and 3 to find which ones actually work (not many), and I noticed this odd bug on one of the few that seems to generally work. Aquamentus can ordinarily be harmed by Super Bombs, but when this flag is checked on him, he becomes completely invincible. That makes little sense.
Vulnurable only to Super Bombs flag = invincible Aquamentus (b403)
Fixity-fix!