In raids, my opponent’s Atomos revived repeatedly even though I dispelled his buff or killed before it reactivated.
Was your kill hit the dispelling hit? Damage is dealt first so the “dispell” would not have happened.
There are other ways to dispell so this may not be the case, but is a possibility.
Atomos revived with both dispel attacks & tile damage. I suspect the issue may be linked to Heimdale.
In my first raid Heimdale activated once. His skill had expired before the issues with Atomos but I was wondering if there could be a residual effect. On my second attempt against that team I was able to eliminate Heimdale before he activated and Atomos subsequently died without the unexpected reviving.