Ibrahimovic got charged for his elbow on Tyrone Mings (who in turn got found guilty of stamping on Ibrahimovic's head and banned for five games). The Swede got three games for the elbow.
In fact, bearing in mind their other recent efforts at dealing with disciplinary matters, perhaps the FA will say nothing, pay Yedlin a few grand to keep quiet, and then in three years time, ban Hemed for something he did before he actually joined the Albion.
I've honestly no idea whether he's "accidentally" trodden on him, or trodden on him. Interesting that Rafa Benitez didn't seem all that bothered either, nor any Newcastle player barring Yedlin.
I fully expect a three match ban, however, as we all know that when the FA don't have any real clue...