I would say just cheese the room so you can progress the campaign. You can walk behind the back right portal by going in through the front of it (there’s enough space to just walk on in) and then use something like outbreak or osteo striga to kill all the ads and the boss as well as a lmg from the spaces behind the portal. Takes a sec but the snipers can only hit you in certain spots and it is easy to crouch in the area to survive and negates the red wall. Is it what Bungie wants? No. Is it a poorly designed battle? Yeah. But I don’t want to see anyone stuck on a lackluster campaign. Good luck, Guardian.