“There are plenty of the crystals inside the cave? That's great, now I can throw the bike crystal in there right away,” Jamie calls out as he then shifts his focus on throwing the bike crystal into the cave to make it harder for the Leviathan to get out.

Yes humans, cursed selkies and young sea monsters can get inside with no problem but something as big as the Leviathan is going to have a hard time escaping if it falls for the underwater cave crystals. Jamie swims as close to the cave as he could while the Leviathan chases after him, the tentacles attempting to catch him.

But Jamie keeps on going and finally reaching the cave, dangling the bike crystal at the creature one more time before tossing the crystal into the cave where plenty of crystals are there for it to snack on.