At one point I apparently pass through a kill-trigger, presumably the one that ends the game if you fall off the catwalk while fighting on the roof, and I die. After Breen frees me, I start noclipping around the map because I can't think of anything else to do. It's been a couple hours at this point - this is like a 15 minute sequence - and I'm not sure I'll be able to get this pose to work at all. I fight through the Combine again (using the rocket launcher, because why not) to trigger the final scene, but once again I can't use the posing tool. When Breen frees me, I use a console code to give me all the weapons, which I wrongly assume will give me all the tools as well.

Maybe I'm being denied the tools because at the start of the chapter all of Gordon's weapons are confiscated by the weapon confiscating machine Breen has installed outside his office, probably due to all the other weapon-bearing scientists constantly riding inescapable metal coffins to the top of his office building to kill him.

Either the game or the mod isn't letting me use the tools I need at the end of the game. The only tool I can use is the regular old gravity gun. Perfect! I open the Garry's Mod menu, spawn a G-Man ragdoll, and take out the posing tool. There's an explosion, Alyx throws her hands up, I disable the AI, and everything pauses. I start the chapter over, ride the coffin, listen to the chats, Breen frees me, we pursue, he gets distracted while Skyping with a large alien cyber-maggot, I get my gravity gun back, I fight the Combine and remember how to get to the top of the citadel without using noclip to fly, I shoot orbs at the thingie, the thingie breaks, and Alyx hops out of a window I probably could have used to avoid that entire fight. So, I noclip back down into Breen's office but apparently I've passed through a trigger or something and the sequence won't continue. I'll need to actually play through the entire chapter to reach the climactic end. I noclip up through the map to the top of the citadel, but then realize, oh yeah, I need Alyx (I don't think I can pose her as well as she poses herself) and the explosion.

Half life 2 chapter