The end seemed kinda shady to me. Silva's knee was obviously to the head and was blocked by Sonnen's forearms and, like you said , slid down to the body.
Joe Rogan kept making it a point to say "knee to the body' "knee to the body" and the ref dint say shit, they never showed the blow or whatever it was that caused Chael to go down/stay down. He just kinda fell after that spinning back fist and gave up. He might've been winded but I'm starting to think this shits setup same way as wwe sometimes and this was one of those times. Chael's a tough fucker. Went in, gave a few lumps, took a few, and then took a dive..........maybe?