Ya,
I agree it is a bit confusing. When you disagreed It confused me too, because I tried to think through it logically. So then I just went out in the garage and moved the contoller to put my mind at ease that I wasn't going crazy.
But, think of it this way. When you turn a rudder on a regular tail, the plane turns in the direction that you move the rudder. This taileron is at about a 45 degree angle, but is kinda doing the same thing. If you only take into consideration the movement in the plane that the rudder would move, it is the same.
I guess what I am trying to say is, if the tail wasn't a "v-tail" but straight across. You would be right. Right up would cause right turn. But, since it is at an angle, the tail affects the"yaw" I guess a litte more than roll. That is why it is like that I think.
I am no expert, just trying make since off all this [

].
Do you agree with my explanation?
Wings