Well, obviously, I have trouble alone, but when I tried to "help", I would usually send my decoy to distract, then hit the Volge shields with a spanner to drain them, and hit the other player to recharge. Was that a bad strategy?
I always try to let the other player that was there first get the kill shot.
After seeing the posts about sometimes no help is better, I'll likely hold off now. Maybe I need to stop avoiding them while alone, so I can get better.

