[ A good question. In this moment he isn't someone she can make use of but someone trapped in the same boat as her. An ally, no matter how unwilling. Her eyes scan the room, noting its layout, the objects contained within, the Siren herself, and then—

Ah, that must be it.

She nods her head towards the hourglass, an excess of sand contained within. ]

She must be protecting that.

[ It's her best guess anyway, based on the objective handed to them from the very start. ]

If we want to be able to save this castle and the inhabitants inside, we'll need to take the sand from her.