When Can I get the Roy Campbell Mask in Metal Gear Solid 4?

I know ur supposed to shock him during the intermission, but in which act can you do that.... I just beat the game twice and didnt see where it could be done... Help???When Can I get the Roy Campbell Mask in Metal Gear Solid 4?
You don't have to shock him; all you have to do is run into him with the Metal Gear Mk. II.





But to get that cut scene you have to go to the main menu and go to mission briefing and watch the very first mission briefing. I think you were supposed to watch this before you started the game because this scene is not in the game. (I didn't the first time either)





Anyway if you watch the scene, and bump into Campbell, you will get his face camo. At the end of the briefing it will say ';you got Campbell octocamo'; and it will ask if you want to save and you say yes. Save over your most recent file. If you load that save file it will pick up wherever you left off and not make you start at the beginning of the game and you should have the Campbell face.





Also if you have not already done it, make sure you get the battery in front of the helicopter in the first cutscene. It will make your solid eye last longer.