I believe that if you use HSS 2 to destroy terrain, that you have to roll 3 non-critical mises in a row to destroy it. Since it reduces your damage to 1, and it takes 3 damage to destroy it. So someone like Northstar, or Kid Flash can break down walls etc even if they only do 1-2 normal damage.

And here it is from the updated rules:

Cheers.

Mind Control damage is not dealt from the target. The damage is taken by the Mind Control user who chooses to try to control 100pts or more of figures. The damage doesn't come from the targets, it comes from the character's own great effort.

Think of it this way - Xavier is about to be pounded by Juggernaut.
When Juggernaut swings, Wolverine steps in the way to have the damage dealt to him, letting Xavier avoid it.
-However, when the Prof. tries to Mind Control his brother, he takes some damage for the effort of doing so. Here, there's nothing for Wolverine to step between - Xavier just hurts himself a little from performing such a hard task.

I hope that helps. In any case, the current rules do not allow the Prof. to Mastermind off damage his controlling player chooses to have the Prof. take by MControlling more than 99 total pts of targets.

I searched for that, but I guess I searched on the wrong word... oh well. Good find!