Regarding one robin

This is not really a post at all in the usual sense. I took some video of a robin in the garden - see below - and wanted an expert opinion as to why it was behaving as it was and so on. Now my brother-in-law is just such an expert so I sent him an email with this clip as an attachment - only to discover that he was unable to open it.

So, yes you've guessed, I decided to attach it to a post here and just send him the link. Anyone else who has an opinion is more than welcome to pop their comments below.