https://u.nya.is/elgajs.mp4
actually watch it properly. Clichy is spinning, he went in sideways got the ball and you can see his body and his weight is actually behind you guy, your guy went down in a delayed fashion, he didn't have to, he wasn't cleaned out. He wasn't knocked over, he didn't fall in the direction of Clichy's movement. If you're body checked you go in the direction of the person checking you, if you have your legs cleaned out you go down in the direction the player was running. He was body checked but flopped over forward. There was contact, but he absolutely wasn't cleaned out. If he'd been smashed hard by CLichy's weight he'd have gone flying off in the direction Clichy was moving.
CLichy won the ball, made some contact, it wasn't excessive force and he certainly didn't clean him out, also not much chance of injury there either.
City need Silva and Toure off, neither have the pace or energy for such a game. Several times when they have broken rather than Silva running at the back line(when someone else has the ball) and create space he stands still waiting for a pass but that limits options and slows the counters.