Vaal Ground Slam w/ Endurance Charge on Melee Stun

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abe1226 wrote:

You should "Gain an Endurance Charge if you Stun an Enemy with Melee Damage" when using Endurance Charge on Melee Stun.

Yes.

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abe1226 wrote:

So essentially I should gain an endurance charge for each enemy around me

No, that's not the same thing at all.
You used the skill, and either did or did not stun an enemy. If you stunned an enemy, you gain an endurance charge. If you didn't, you don't gain one.
It doesn't say that you'll get more charges for stunning more things.