New Swift Mob

I believe that the swift would be a major change to mining in Minecraft. This is because it is a mob that is able to steal diamonds when dropped on the floor as a result of it being mined. It is really quick but roams around a small area. Once hit, it drops the diamond and comes to attach you, but dies in 3 hits of a stone sword, meaning that it can be killed very easily. It can drop skinny bones (used to make tools bigger, which increases their durability and can only be used on a tool once). But the fight with the swift is optional and can easily be avoided by giving it anything as compensation for hitting it (anything but bones or rotten flesh) as it will simply leave after that. There is a 4% chance that a swift appears when you are mining.