I think that's harsh too. Getting sent off because your opponent puts his leg on the floor and you stud it just seems a bit too much to me. It was certainly studs on flesh, though. Just think a lot of players would have done the same thing Pogba did there as Bellerin's movement was a bit different. I suppose the argument is that all tackles have to be made in the context of the opponent's movement but I think i'd be really frustrated if Fernandinho were sent off for that.
On the plus side, Pogba now out for the derby although it's United so they'll probably appeal and somehow win because you know, they run the FA