Raven vs Pigeon

Interesting occurance while I was on break at work. A very large raven attacked and pursued a pigeon from the air to the ground. Once it was on the ground, the raven proceeded to cripple the pigeon's wing, so it couldn't fly, pinned it down and proceeded to pluck a great deal of the pigeons feathers. I am quite sure the raven would have then killed and eaten the pigeon but a coworker decided to interrupt the raven at his work and chased it away. The pigeon, apparently not as dead as I first thought, fled into a crack between the sidewalk and the side of the building where i am assuming it will die from it's injuries. The raven flew off and probably searched for other food elsewhere.

Thought this was an interesting occurance.