This is odd... I was fooling around in a HL mod I made (Different models), and I decided to play the final level (c5a1) I noclipped to the outside of the tram, and jumped into the portal from there. I saw a short camera scene with Gman and the player.mdl model, when I was used to blackness. Intriuged, I quickloaded the game, and crouch jumped into the portal. same thing. So, I went to vanila HL and tested this. nothing. THEN, it occured to me to have the flashlight on. the scene showed up. That's completly new to me, and I thought perhaps not all of you guys knew. Try it!