Vengeful blade advice

Vengeful Blade - Cantrip

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and then radiates a dark aura of energy until the start of your next turn. If the target makes an attack or casts a spell before then, the target takes 1d8 necrotic damage and the spell ends.

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This spell specifically says, “if the target makes an attack…“ And does not say, “if the target makes an attack action“. The spell also points out that the conditions last, “until the start of your next turn.“

To me, this reads as if every attack the baddie makes, the baddie is going to proc the extra damage.… So if a baddie gets multi attack, they could get multiple hits from this spell. Technically, an opportunity attack would proc this spell as well.

Dropping this cantrip on the right target could get it to proc three or four times in one round.

Start combat with Armor of Agathys on. Hit your target with the vengeful blade cantrip and then just walk away. Sure, you open yourself to an OA, but at level five they are taking 15 cold damage from the AoA (maybe more if they don’t eliminate all of the THP in one hit), plus another 2D8 necrotic damage for each time they attack afterwards.

It’s possible you do more damage to them on their turn then you did on your turn… this may have just become my most favorite spell.

Unless I’m reading this entirely wrong!?!?

Edit: the answer to my question, yes. I was wrong. Special thanks to those smarter than me.