This advantage says it causes damage to the target every time they try to charge a power. Has anyone tried this yet? How much damage are we talking about, and does it interrupt the charge attempt? Right now I have Uppercut at Rank 3, but I'm wondering if it would be worth it to retcon it to Rank 2 with Head Trauma.

It applies some kind of stun rather than damage, however there is no information about duration and magnitude, which is a shame....

Was looking at this last night, and until the retcon prices are fixed and, hell its impossible to tell if its even bugged wtihout leaving the PH, i'm just gonna leave it alone for now.

The stun might actually be preferable, because it would interrupt the charge. Right now I use Beatdown's relatively frequent (if brief) stun or Uppercut's knockup to interrupt charges, which usually works fairly well but can cause me to break my planned attack chain, and isn't as effective when the mob starts trying to kite me.

It can apply a stun. It last 5-10 seconds but if you hit them again then it will be interrupted. Its pretty handy especially in boss fights or with multiple villains that have charging powers. Lets you recover with heal (if you have that type of power) and then charge up a full attack. Has similiar stun animination to Beatdown. I believe that it does cause some damage to them but the stun makes it more than worth it by itself. The only downside is that you can't fully rank up the damage on Uppercut if you get it.

You said 'pretty handy on boss fights', what type of bosses? Will it work on Supervillians? The only enemies I can see myself needing it on are the ones most likely to be immune.