Has anyone done any serious testing of this ability?

If warrior A has 50% mitigation, tanking a mob that hits for 1000 pre armor; B has 40% migitation, B intervenes A. Does B receive a hit for 500, or 600? Can B be crushed/critted by the intervened hit? Would B receive rage? If the mob attack has a secondary affect, would B be affected instead of A?

The damage taken HAS to be based on the intervening warrior's mitigation. Intervening a priest because you missed Nightbane's landing would get the tank oneshotted if the damage taken was based off the priest's mitigation, therefore making the skill useless.

The intervene'ing warrior will be hit like the original hit was against him with a regular combat table. Ie: if he is above 490 defense, he will not be crit, and he will receive rage.

It seems to only work for auto-attacks, not specials. (unconfirmed) But my evidence is on the nightbane fight: I will intervene whoever is getting the smoking blasts, and it will give me the first hit from the skeletons, not the blast damage.

Intervene seems to work about as well as spell reflect, in that the mechanics aren't really logical. (example: can reflect multiple spells if they occur at the same time)

The smoking blast is a targetted AoE, rather than a specifically targetted ability, which you can't intervene.

Thanks guys. I guess I'll grab a few warriors in my guild for some testing

Using target of target it seems that intervene works as a mini-taunt. I'd see the mobs target switch to me for .5-1 second then go back to what he was doing. It seems if the mob gets stunned or has a slow attack timer I might not get hit at all.

I've found it more useful for moving places quickly, like out of Aran's arcane explosion or to track Maulgar down after a fear.

Seems to perform just as if the mob/player took a normal swing at you. Intervene can crush. I try remember to hit shield block mid intervene if I can, or remember to. Usually I'm just spamming taunt as I charge to save the squishy. It seems that Intervene treats the hit as if you were facing the target, regardless of which direction you Intervened from. I see a fair bit of dodged or parried Intervene hits.

Also, secondary effects can proc off Intervene hits. I've had Enrage proc off an Intervene hit.

The real question is, what happens if two (or more) warriors intervene each other and one of them takes a hit?

The second one who intervened, regardless of who gets hit by the mob (just like a double-taunt; whoever taunts a fraction of a second later gets the mob).

Did you test it yourself or is it just a guess?

Personally, I'm just disappointed that there haven't been any encounters released yet that can be cheesed by chain intervening with 10 tanks.