Jack picks up on the sarcasm despite the fact that she doesn't actually say it and offers her the mental equivalent of an eye roll as he heads for the back of the building.

It doesn't take him long to find the previously mentioned backdoor - nor does it take him long to get it open despite the fact that it's clearly labeled as a fire door. He holds it open for Henley and then heads for the stairs, jogging up them toward the floor he picked up from Dylan.