Well I was at least sure now that this wasn't a pure Pallid Harrier, so I ones again put it out on the Bird Alarm and wrote that it could be a hybrid. I shortly afterwards received phone calls from some confused birders that had found the bird a bit away from were I saw it. They had exactly the same impression I first had, that it was a Pallid and couldn't see anything that pointed in any other direction.
I didn't see the bird more that day and decided to report it as an unsure hybrid between Pallid and Hen Harrier.
Luckily I found the bird again the next morning, and this time it was much closer. It stilled looked like a Pallid but now I could see that it actually had five fingers instead of four and that the hand was to broad for a pallid. Now I got some photos of the bird as well and I wasn't unsure any more. It's definitely a hybrid between Pallid and Hen harrier. First time this hybrid has been observed in this part of Sweden.