This is why the storyboard trick where you point the camera away at the dramatic shot, then show someone appear where they weren't there before, cannot be done if you just shoot the scene wide, nor can it happen in real life because your peripheral can see the person coming.
Unless the person...
Anyone else hallucinated that Noel got Hugo's confinement overturned in the party or whatever so there's no need for a prison break?
Or did he anticipate assassins so Hugo was never going to walk free.