Before you fret, this isn't a conspiracy on the name of G-Man, just rather how I think he transported around. For quite some time I was curious, you see him in certain places, on a train, in a window, and so forth, but he appears to walk into somewhere that is a dead end. I've always wondered how the hell did he leave, get to a specific spot, all before you even had the chance to? Then I thought about Xen. I believe he is using the teleportation that you use when you go to Xen. I may be wrong, but it is probably a feasible theory. Any comments on this?