I didn't say any Azov's would be alive when they do it.
Sounds like they are going to starve them out, and then I would expect someone to go through it. There will be a handful of dead enders that have to be killed out.
I also think the Russians want them dead.
If left alive, many of these Ukrainians will become trouble later for the Russians.
It will be hard for Russia to monitor / track these folks.
I think if there is a chance that chem weapons are used (low probably), this would be the time and place. Sort of an ideal situation. No civilian casualties, safe for ones own troops, easy to employ, good psychological effect, maybe a good environment (enclosed spaces).