Was the guy really that unable to defend himself? I've seen fights go much further, and he did land a punch or two. Indeed that way is safest, I just wonder why it was stopped quicker than usual. Though I would say Khan was always going to win.
I think the bloke was going to get hurt to be honest. He'd have got knocked out and had no chance as he was taking a pasting. Better to get him ot of there than risk him getting seriously hurt IMO.