Great report Jos!
How do you just randomly run into a Hawk Owl? That's just unbelievable!
In September 1993 I hitch-hiked north through Norway and camped somewhere north of Tromso one night ...climbed out of my tent in the morning to find a Hawk Owl perched on a small conifer right next to me. So started my luck with Hawk Owls. Since then, though I have only once specifically looked for them, I have seen them on almost every trip to Scandinavia, about ten birds by now, including a fluke finding of a pair with chicks. I guess I am just lucky with this species.
A couple of previous encounters: adult in Sweden, chicks in Finland: