I agree with the getting smoked by a cat idea. I remember last summer I saw a robin bounce off a windsheild out front of my house. I stopped traffic to run out and grab it lol. Same exact thing as you were seeing. It was gurggling and not moving to much. I put it in a deep open box out front with some food and water and a hot water bottle. All his buds were pretty pissed and were chillin around squaking for him/her. About an hour later it was gone.

Good job!