Since he's optional, spoilers ahead.
I'm fighting the giant crab or whatever in Bubble Cave. I manipulate his bombs, Nature Form him off the ceiling, and blow him up...and when he takes his third and final hit, all the other bombs on the screen detonate...forever. They just repeat their detonation animations endlessly, the boss hangs there doing nothing, and my controls are locked out, forcing me to ctrl-alt-delete out of there.
Reloading the game and beating him again caused the crash again. Anyone know what's happening, and if it's fixable?
Edit: I tried beating him again, without having helpful leeches on me, without Li in the bubble with me, and without (by chance) any other bombs on the screen. The crash didn't happen.