Actually I didn't know we could swap weapons after attacking before.
Xan/GM4L/CE were doing that all the time in Chapter 11x 
Get yo glasses, bruh v:
To be fair, they'd kinda sorta be dead without shenanigans. Seriously, I've driven through towns with smaller populations than the number of enemy troopers you threw at them. ^_^
This. Seriously, if you don't like trade shenanigans, perhaps you should tone things down slightly so that such shenanigans aren't
necessary for simple survival.
Unrelated to current trade discussion:
Candy, do NOT press the button. Powder, have Efa tell him in-character. I understand your desire to get into the fray, but if you hit the button now you screw over Miguilla's, Fezzina's, and Alyssa's chance of doing anything useful next turn. So please, hold off. It's not like you'd be able to cross over immediately anyway, you'd have to sit for several more turns before getting to the fight.