[Snake]

Sure, we all saw today someone do over 740 hybrid damage by simply double-tapping the skill while surrounded by four other players. (On 8x Schwarz Sturm, mind you.)
That was a terrifying gimmick, it ended the whole 4x4 PvP fight there, without any effort, without any counterplay. The power that not even a Finisher has, or the drawbacks it gives. (Like the Schwarz Sturm reset.)
So I'm down with Spooks suggested.

Now for a small tweak correcting at where Nachbeben should be activated, I say, make the boxer be the one releasing the shockwave with the extra wind damage that activates only once, not the enemy hit. If using Orkam Drehen.
I mean, the skill 'hooks' you in, then applies the damage. That's unfair and SUPER cheesy.

THOUGH.

As for Felsmanege and Korkenzier. I don't think they need any changes on their interaction with the passive.

The first is a Finisher, it's worth the damage it does, because after it, the Schwarz Sturm will reset to 0, you can't spam it for insane damage.

The second is pretty 'hard' to collaborate with the Boxer, since you don't have control over it's distance, and that not everyone stays in a line, and are mostly in diagonals. And you can't aim that well, due to the lack of movement, since a single move can reset your Schwarz Sturm.

But I think that's just me.