Macho or Bird Brain?

Thursday was a "weird" day. While in the kitchen cooking I could hear this bird, which sounded like it was in the bedroom trying to get out. This totally confused me since we hadn't been outside, it was cold in the 50's and the wind was just horrendous. A totally nasty day.

I walked back to the bedroom trying to find this trapped bird and hopefully catch it and send it on is way. How wrong was I.

The trapped bird was actually on the outside of the sliding glass door, it has the reflective film on it to keep the sun out. He was throwing himself at the glass fighting with the bird he could see.

This isn't the best picture, but it was taken from the inside and if you look closely you can see him.

Here he is on the side of the screen.

I went outside to get a better picture, but to no avail. So I chased him off or so I thought. I no sooner got back inside and there he was, back again.

He was there all day, trying to chase off the other bird that had invaded his territory. I think he wore himself out. Haven't seen him since.

I haven't decided if he's a bird brain or just one macho house sparrow.