Plunging back into the darkness, Julian made his way to where he'd last located the prisoner. Approaching slowly, he again placed one of his hands upon the prisoner's shoulder, as though to say "It's alright, I'm here to rescue you". He fiddled with the lock blindly, trying each of the five keys until one worked.
OOC:
Presuming the keys actually work
Presuming they may be injured or otherwise weakened from their imprisonment, Julian helped the prisoner to their feet. Throwing one of their arms over his shoulder, he helped them to walk out of the cell, from the darkness into the light.