Witchbane

I am posting this here because I feel like I'm going insane. The Witchbane skill from the Witchhunter says as follows:

Enemies have Maximum Concentration equal to 40% of their Maximum Life
Break enemy Concentration on Hit qual to 100% of Damage Dealt
Enemies regain 10% of Concentration every second if they haven't lost Concentration in the past 5 seconds

Does this mean that Minions can contribute towards depleting the concentration of an enemy? It doesn't say that you need to directly hit them to break their concentration, just that their concentration get's broken for 100% of the damage dealt when hit. I was thinking on going Gemling and playing summons, but this feels like it should work by the way it's written? Like, when you get Witchbane you just unlock Concentration as a mechanic to interact with and it would make sense that hit-based allies could help depleting Concentration.

At the moment, you can't get Witchbane node if you choose Gemling Legionnare because Witchbane is from Witchhunter. We don't know yet if there is any items that works similar to forbidden flesh & flame. However, it is safe to assume that the node works on the minion you summoned since the node does not specify who does the hit, or have "You" in the description. Could be wrong tho.