Ill try to help ya out NBT you're talking about the guy who snipes you? If not completely disreguard this post
Spoiler:
Well he gave me some trouble but I eventually got him. The most annoying thing he does is where he shoots out tons and tons of laser beams but that can be avoided. He first just stands still and spins around you can easily jump over the blast. Then he will jump off the platform into the air here he doesnt move really fast and he doesnt aim for you so just stay out of his line of fire. Then comes the part that got me killed where he shoots thousands nonstop you have to run in a circle but it can be a pain if your teammates are in the way so try and avoid them. Then when he shoots those giant blue blasts just use reaction he'll use more and more as he goes it's sometimes hard to get all of them and I just dodged them and ran up to him while he shot them it worked for me but I got alot of damage done to me. well that's all my advice hope I helped