That's not illegal, it's just a great, big hit.
Of course, this is familiar ground for FSU. It was just last year when Nigel Bradham hit Laron Byrd in a similar way and was ejected immediately, only for the ACC to come out a few days later and publicly apologize for the bad call, and say that the hit was in fact legal:
The funny thing is, pay attention to one of the ACC football commercials during one of their national games. Their conference highlight reels feature tons of hits like that. When they actually come during the games, they result in penalties.
ACC football: hit too hard on defense, and you'll get flagged and/or ejected! (But at least you'll receive a formal apology later in the week, and that referee crew will get suspended for a game)
Of course, if Joyner was wearing a UF, South Carolina, or LSU jersey, it's seen as a clean hit and a great example of "SEC speed!"
The ACC is seen as a bad football conference for a lot of reasons, but horrible, ticky-tack officiating on a weekly basis doesn't help.
Stinespring has been the constant coach who fans have wanted as the scapegoat.
"Beamerball" hasn't existed for several years now. This is the best defense Foster has put together in a few years, but his units have slipped from their former glory days.
At least Frank Beamer hasn't complicated things by hiring one of his sons as an influential staff member....oh wait.
At this point, barring Beamer just choosing to walk away completely (which is unlikely, considering how much proud he has in his job and in what he's built that program into), I don't see how this doesn't ultimately end in a very ugly Bowden/FSU type of PR debacle.