This quest seems to bug out when you manage to convince Dima to confront the town people about avery
He is in the midst of all the people, quest marker is on him
Say "Dima, its time!", and he responds with a single line which he will repeat if asked again ..
.. So nothing progresses from here.
Unless I am missing something not so obvious I think this is a broken quest line
Mentioned it also on Bethesda.net
https://community.bethesda.net/thread/21968
No answers so far, so I guess Bethesda have gone into dont bug us about bugs mode now.
We have your money and dont care the game is SNAFU again.
Screenshot:
https://i.imgur.com/LouqNQX.jpg
No mods in use.