Most of that magic is channeling, not all, but there might be religious implications of using magic for this reason.
I personally hate "The aura always knows" answers. . . .
My personal rule is that with the conscious, can choose to be willing or not. . .the unconscious are always willing.
This avoids the issues of "We need to teleport, but joe is unconscious so he can't give permission so we can't.". . .caster can just cut your unconscious throat, if they want to teleport you into a volcano or heal you, same difference in my book.