Ba'al does nothing to stop him. As far as he's concerned, this is working out rather well.

Mike will find the door unlocked but everything after that will get more complicated. Many corridors look identical, while it's not quite a maze but it's not easy to navigate either. There's no sign of guards until he nears where Briggs' cell is. In the time it takes for Mike to find it, Briggs has managed to silently take down one guard and take his gun.