Rpg Maker Developers Group

Hello, first off, I just wanna say that I've had no luck finding or making a solution to my problem, but if there's something I've missed or a simple answer, then please call me out on how dumb I am.

To explain the title better; I want a certain Common Event to run after all enemies are dead, but before the EXP window appears.
The reason for this, is that I've (somehow) managed to put together a Summon, that first attacks when summoned, stays for the rest of the turn, and then leaves.

My problem?
Well, I've chosen to go with tinting the screen and hiding the battle hud (to make the summon feel more visual, etc.), but if the Summon kills the last target (or all at the same time), then I have no way of returning the battle hud and tint before the EXP window appears, which it doesn't because I've hidden it.

Visual aid:
Protected download

I'm using a lot of scripts, but I think the most important ones in this instant is:
Yanfly's Battle Core + Action Sequence 1-3 http://yanfly.moe/yep/
SRD's Summon Core + Replace Summons http://sumrndm.site/mv-plugins/

I've tried different plugins, eventing it, and even gave script calling a shot, but no dice. I am way of my league here, and could really use some help.

This is gonna sound rude of me, but all I really want is a way to check if all enemies are dead, and if they are, I want to run a Common Event before the Victory Screen/EXP Window is suppose to appear. I've been pulling my hair out for the past 6h...

I really hope this is enough information, thanks in advance.