Ah, okay. I totally missed the one at Liar's Berg.
I get the feeling I'm playing Maya wrong... I seem to be incapable of playing any game without somehow playing like I play Pyro, so I am basically lurking around corners with a shotgun and treating Phaselock as an airblast with cooldown to trap specific enemies. I'm managing to get through stuff though, so perhaps I am actually doing SOMETHING right.