A doomed chiffchaff

I was surprised a couple of days ago on 16th November to see a chiffchaff (gransanger) flitting about feeding in an apple tree in the garden. I saw it again today and made a short video and a few pictures (below). There’ve been several observations in the neighbouring municipalities recently as part of a trend as our autumn gets longer. However, this seems to be the first ever observation in my municipality (Malvik) in winter (November-February).