Jack wasn't sure what to do when the girl noticed him and ran, though he didn't blame her for doing so, given where she had come from. He landed and tried the door, knocking on it when he found it was locked. He didn't really think she'd let him in, but there wasn't much else for him to do besides kicking it in or otherwise breaking the lock - something he could do, but he doubted would make her any more willing to talk to him.