No idea if there is some use for this. This just seems like a harmful bug, though easy enough to get past.

The Flight Spell has a glitch where it will cost 24 mp. If you cast it with NO mp the bug actiates. Go into some event like a battle and you can cast it like normal again.

The second way of activating it is to cast a Passwall in battle then run. Then try to cast Flight outside of battle.

Weird lol Not sure where we'd want to use that XD