Firo recognizes her voice immediately, and at first he's too relieved to register that she's telling him to leave. She's here and it doesn't sound like she's in trouble. That's good.

He sighs and leans one shoulder on the door, trying to pretend his knees aren't a little weak with relief.

"What're you doing? I've been looking for you!"

As if she may not have heard all the shouting and knocking.