If you get hit with Petrify underwater, your character automatically sinks to the bottom and shatters. If they get hit with it on land, they won't immediately shatter, but if they get hit with an attack, they will.
Seymour's second form tries to do this frequently. He'll hit a character with Break and then have that little parasite thing attached to it hit the character targeted with Break its next turn.
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"I can set you free, mate."
"My freedom was forfeit long ago!"