Quote Originally Posted by Lysander View Post
Or say that IHS can be used as an immediate action to counter mental effects before they take hold, while requiring a standard action for physical effects.
Indeed.

There's a point where you should cross the "Trying to specify it in the current rules." versus "Let it exceed the current rules and just get to the point." for the sake of simplicity in playability.
I believe this is one of those points.