@Jnr6Lil: The fact that bloodbending can only be done during the full moon has nothing to do with a bender's physicality, and although you can heal with it, water benders can heal without using bloodbending. Healing is a sub-skill of waterbending. Also, Korra may not love Mako, but she obviously has a crush on him, and I was joking about the avatar state being triggered by jealousy. Also, watch for spoilers.
Yes it does. Because it can only be done in a full moon which gives benders more strength, has to do with physicality. And I see no crush.