Are you familiar with Pepe, the Portugal and Real Madrid center back? He's a crazy person and gets red cards for being crazy all the time. So when Thomas Müller went down easily off a hand to the face from the big Portuguese defender, a lot of people saw this coming.
For that headbutt, he's been shown a red card, and Portugal are about to get blown out. They're already down two goals and their starting striker got subbed off injured.