He was in the process of moving his foot towards the ball at a normal rate, as he saw the bloke flying in he dramatically sped up and adjusted that movement to avoid being clattered by a two-footed lunge. If the opposition player's tackle wasn't so reckless/dangerous Calderon would have played...
The reason Calderon takes suck a big swipe at the ball is because their player is going in two footed. It's an evasive action brought on by a terrible tackle which Calderon sees coming. Unfortunate for their player, but he shouldn't be diving into tackles like that (note: I'm NOT saying he...