User blog comment:Deathmanstratos/Call of Duty: Advanced Warfare "Induction" Singleplayer mission shown/@comment-112.204.160.194-20140612180405/@comment-1187559-20140615135719

Sudden amputation doesn't hurt as much as you think it would. It's not a sudden pain over a small area like a bullet shot, or a needle prick. It's distributed over the nerves so much and so fast you actually wouldn't feel it if it was fast enough. So realistically he likely wouldn't be screaming in pain, and the silence may be from general shell shock.