[Hydra]

He doesn't care. Once Yuna and the Dress sphere and destroyed, Lennes spirit should appear. Like Shuyin's is. Well, that's my guess anyway. So, he wants her out of it, and in order to do that, he needs to defeat the person who has it, that being Yuna and her party. So, yeah. If you wait long enough, he'll blow up everything. And you get the worse ending.