Aiden lets the door David locked stay locked, it another barrier between him and Umeni and not stopping him at all, for all that he's coming at him from another angle. He lets David fidget with his phone, too, still trying to decide if he's another hacker or just a thief. If he ends up trying to phone a friend or open a door Aiden doesn't want opened, he might look for a vulnerability in his phone and try and get in to scramble it, but for now, he does nothing. This might go better for him, if he can lull David into some false sense of security -- he may not be safe here, with Umeni running around, but maybe someone is trying to help him.