It's definitely a foul on Witsel's behalf and he deserved a red card for it. And probably a lengthy ban too. But fact is, the reason Wasilewski broke his leg is the intensity of his own tackle. Not to mention that it's very likely that Witsel went in the way he did, because he knew Wasyl's reputation and he knew how he'd be coming in too.
Besides Wasyl's major offences were elbows all the time.
