Hes not a defender though he's a keeper, I can understand closing down a forward if he's bearing down on goal with no defender in front of them, suarez was at an implossible angle and not hitting it there and then would have given the defence a chance to reposition. Secondly he wasn't the last man/ defender which is the rule for keepers, a step in the other direction and Baines cuts the angle which he does, if Howard doesn't go MIA were laughing at Suarez.
when the ball got to suarez baines was our closest defender. Baines was on the floor in the middle of the goal with the liverpool forward. if howard hadn't of gone out, suarez would made himself a better angle (under no pressure) and slotted in the corner. baines had just got up when suarez shot.