He can't see around the corner, but he hears a woman's voice. One word, but she's got an accent...something European, but he'd have to hear more to know where specifically. Anyway, whoever it is, she's definitely not a splicer. And more surprising than that, she...knows Jack?

Sinclair watches Jack's face for a moment, trying to determine how safe it would be to step out and look at her. He doesn't seem to be afraid, he looks. Well. He looks the way he did when Sinclair first approached him himself, only perhaps a little less uncertain.

But he doesn't pick up any signs of immediate danger, so he walks out beside Jack.

...He knows this woman. He's seen her face before, but he can't place a name.

"Have we met?" he asks with a friendly enough smile.

Because she was definitely talking to him.