You're correct. That is former UConn guard Ryan Boatright dunking, posing and then avoiding a trumpet attack from a fan rushing the court. Really though, this can't be shocking. This has to happen almost weekly in European hoops. You dunk with less than 3 seconds to go in the game, you have to keep your head on a swivel. Fans don't fuck around over there. It's a personal insult if you do that to them, despite them not playing 1 second. As for the weapon? The fact that it's a 'fan trumpet' (according to google translate) makes it that more hilarious. Literally using anything they can find as a weapon for an on the court attack. Head on a swivel when you're playing in Europe. Head on a swivel.