Something i noticed about intervene was when i intervened our MT at maulgar to reduce the incoming damage a bit. I first got hit by a arching smash and then a normal meele hit, killing me of course. Has anyone else got a special attack + normal attack at the same time when you intervene?

Arcing Smash hits everything in range of it, so you likely took the regular hit as a result of the intervene, and took the Arcing Smash just because you happened to be standing there when Maulgar used it.

True about BBW, Intervene makes this fight so trivial...

From playing a warrior for an evening at mag it seems to transfer the hit directly to you, including a chance to crit/crush if you dont have shield block up.