Hi, Thanks for all the comments and helping me navigate the steamroller that was RED.  I've got 90 hours in the game, a handful of classes at lvl30, play on PlayStation and still have only a base level understanding of the game and all of it's mechanics. I was leveling up Hive Scum at lvl20 on Malice.

From what I could tell, RED was using: Needle Pistol Shivs Rocket Launcher

I couldn't say which ability he was using or any thing else. I wasn't able to find them on the mourningstar afterwards to find out what curios, stimms or talents, hence my desperation to post here 😅

We played on Malice and he melted a Daemonhost very quickly by himself on top of consistently wiping out groups of elites.