http://www.insanee.com/update/animals/youre-free-nope-youre-food sorry I couldn't embed this.. I was emotionally distraught
Watched something similar happen when I was a kid. A girl who lived two houses up from me had rescued a young bird who couldn't fly. She was taking care of it and was letting it hop around in her front yard. Suddenly her cat pounced out of the nearest bush, grabbed the bird and was gone. She screamed bloody murder. Just goes to show that if there is a God he's a rotten sumbitch!
Why would God be a "rotten sumbitch" in that situation you described? The cat is doing what a cat does.