Injury after Shirt Pulling foul

[Tactician]

Player A spits on player B.
Player A is not going to get away this time.
Red Card.
Player B is holding his ankle. He looks injured.

How can a player injure his ankle by another player spitting on him? LOL

By the way, it seems that some players have hidden special abilities. For instance, the habit of getting red cards.
I had a player like this in my team; he had two red cards in the 'space' of a few matches. I sold him.