Two snaps in quick succession herald the sawing through of the last two straps, and then Liz puts away the knife and closes her fingers on the fire.

They're only in darkness for a split second before she lights up her other hand, her left hand. Now with her good (right) shoulder free, she offers Charles her right hand.

Get him out, she thinks; gotta get out of here, deal with the guy outside, and then she can come back in and keep looking for Red and for her team.