That's the first time I've ever intently killed anything bigger than an insect before and I felt absolutely shit for it.

Basically it flew into my brother's closed bedroom window, smacked its head so the flesh/ skull was showing and was standing there dazed. I picked it up wearing gardening gloves and put it down out of the cat's reach then inspected it. It's back and chest were bloody so I think it was diseased or had been got at, there was also blood coming out of its mouth so...