Soulbinder class overlord card - Possessive: “Play this card when a hero defeats a servant. That hero suffers 2 damage. Then, if that hero was not defeated, perform an attack with that hero as if her were one of your monsters.”

Elemental Class Card - Tide: “Exhaust this card after you perform an attack. A monster adjacent to the target space suffers damage equal to the number of exhausted elemental card.”

Hero attacks and defeats Scourge (servant). Overlord plays “Possessive” in response after dice are rolled and before the Scourge token is removed from the map. The 2 damage caused by “Possessive” will knock out the hero. Hero group argues that, because “Tide” states “after you perform an attack...” that they can play Tide to destroy a large monster with low health nearby. Overlord argues that, no, the hero cannot use “Tide” because they are knocked out immediately - “when a hero defeats a servant...”. What are we supposed to do here?

We ended up going with the heroes on this because they were losing the encounter anyways. Because this is early on in the campaign, we want to know how to properly address this engagement in the future.

First I adivse you to have a look to CRRG from Sadgit : https://descent-community.org/index.php/crrg/

Then here are the steps of combat
1 Declare weapon and target
2 roll dice
3 check range
4 spend surges
5 deal damage

for step 5 I will specify that inside we have
a- do damage
b- do defeated stuff
c- repeat a and b for next affected figure

an attack is only ended one all this is done

So the defeat of Possessive triggers during step 5 b (just after damage is done but before the attack is over)
this means we have another round of attack steps 'inside' step 5 of the hero attack's
Once Step 5 of the 'Possessive' attacks ends (or if the hero dies from the 2 initial damages)
we revert back to resolve or end the attack from he here

If at this stage the hero is dead ... every thing ends and he can't even trigger Tide ... his attack was indeed never fully performed

A further proof of that : simply suppose the hero's attack is a multiple target attack against, let's say, the scourge and monster A
If the hero tries to damage the Scourge first on his step 5, he will be dead before doing the rest of his attacks actions : 5 c and so before doing damages against monster A
Monster A will never be damaged because the hero died before the end of his attack.
Further advice : always take care of the order in which you deal damages when attacking multiple targets .. 😉