If you click on the first picture, you will see that the Merlin clearly has blood on it belly, but it flew just fine. If it was injured, the injury was obviously minor.
|Merlin taking off|
|Merlin in flight|
The Merlin is known by the alias Bullet Hawk, due to it's bullet like speed when it attacks it's prey, which is usually all unsuspecting. In fact the Merlin's speed makes it difficult to capture on camera without a fast shutter speed. The Merlin's other name is Pigeon Hawk, as it will not hesitate to go after larger prey, such as Pigeons which are bigger than the falcon itself. No doubt this is why it was a favorite for keeping by falconers.
To give you an idea just how fast this bird is check out the photo below, which I took a couple of years ago.
|Merlin speed of a bullet|