The 90-Day Non-Compete Clause

[Xero]

What would TNA and the talent in question face if their WWE contract was up, but they ignored the 90 day non-compete clause?

Let's say, for arguments sake, Rey Mysterio is fed up with everything and just wants to quit the business. His contract was up yesterday, he was on WWE TV last week, and TNA brings him on TV for a one-off appearance on tonight's show as a "surprise".

This obviously sets off breach of contract for Mysterio with fines, lawsuits, and likely some kind of thing that says he can't work for another wrestling company for x amount of years. But what kind of backlash could TNA face in this? Are they liable at all?

Edit: Actually, I just realized that I THINK the 90-Day clause is only in affect if their contract is terminated. So let's say he was released yesterday. If I have that wrong, let's just say that the clause is in effect.