Mech pilot: Two pistols and backpack.
Watching as Caville fumbled with the pistol and Roman passed her his own, Eira reconsidered their choices of armament. Though she herself had little skill when it came to plain old human combat shooting, she felt like maybe the man would feel better with something a little less tactical. Unslinging the rifle, she checked to see that it was ready for use and switched it with the pistol she had just passed over. "Here, take this. Take a little less aiming and a little more praying, if you know what I mean."
Eira now held one pistol in each hand, both armed for combat. She'd already received decent training in the art of dual-wielding with Mercy, and only hoped it wouldn't be too hard to translate those same talents over to these far smaller and far less powerful guns.
Now that they were in the sewers and Mercy was naught but a big hunk of scrap metal above them, the young trainee was feeling far more anxious. It was one thing to be attacked when in a giant metal suit of armour, and another entirely when all you had was soft human flesh. I hope Roman knows how to handle himself down here, because us pilots sure don't.
At least there was some hope of salvation, if a bit uncertain in where it was to be found. Two more paths to take, another decision. "They look pretty much the same to me," muttered Eira. "Lead the way, Roman." She would follow him whichever way he took, and make sure neither she nor Caville fell behind or strayed. But at the same time, she made sure to glance behind her as often as not, making sure nothing was stalking them from the biomass north of them.