Sent to the penalty box, Slaf clearly disagreed and made it known to the referees, but there's more.
It's normal, he's still a very young player, and winning is important to him. He's emotional, and that's fine, but he still has more to learn.
Clearly, it's a frustrating tournament for him, but he'll gain a lot of maturity from it, and I love that. Uncomfortable beds or a fire alarm in the middle of the night, he'll experience these kinds of things in the playoffs, even in the NHL.