Concentration - marksman tree

Can someone please explain to me how this passive CONCENTRATION works in the MARKSMAN tree? It is supposed to grant an immediate 2% flat damage increase (per invested point up to 16%) until you are hit by an enemy
Well, whether I have a point put into that passive or not, my flat damage (the one shown on the tooltip) from my UMBRAL BLADES skill doesn’t change

So what is it that I don’t understand about this passive? Thanks

Tooltips aren’t good indicators of damage, many don’t take many things into account.

Go to the arena area, hit a dummy a few times, place points on concentration, hit the dummy a few more times and compare.

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2% more damage per point. And yes, it should be visible on the tooltip but it’s not a massive amount & sometimes it can take a few seconds for changes to register.

And yet this & gear are exactly what the tooltips are for.

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Sure, but my point is that there could be a bug and concentration isn’t working, or there could be a bug and it isn’t showing in the tooltip.
And you need to go to the dummies to test which it is.

Either is a bug, it’s just a matter of knowing which one it is.

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Thank you for your answers