I've looked very hard at that and there is barely any contact.
Again:
1- If you're running full pelt and someone touches one of your legs
making it impact another of your legs, as it's obviously the case, you're going to fall like that, and it hurts. I think people never takes into account that replays are at slow motion and this play in real speed it's just as if he had tackled the player, because he makes him trip with his own legs. I've suffered many of this "barely contacts" in real life and I can assure you that you will end up in the floor with some hurt or even worse an injury. The unexpected tackles are the ones that can hurt more, because you're not anticipating the contact at all, and you're not ready to react to the contact.
2- Now, about how much did it hurt and how much was him playing while in the floor, it's something only Torres knows. To me, he exagerated the time he was in the floor.
3- I don't get why you start talking about Busquets when we were talking about Torres. Busquets is indeed a disgrace. I hate him and stated that many times. He IS a diver and a pathetic professional in my oppinion. But so is Drogba, Ronaldo, Lucio (you should have seen him in the CL here at Barcelona, falling to the floor every minute), Maicon (he was "injured" out of the field, he got up, walked INSIDE the pitch and let him fall again so he could stop the play), or a lot more players, given the situation. Unfortunately, it¡s hard finding a player like the good old Ronaldo (brazilian), who would never stop playing, if was going to the ground, he would stand up and continue running. There's few players like him.