Okay, they might be half-made fallen angels with flaming swords, but that just means they have no knowledge of modern, scientifically-developed fighting styles. Turns out you can hip-throw a person-sized blasphemous entity of shadow and pain almost as easily as you can a mercenary, and the blasphemous entities don't even carry ranged weapons to complicate things. Shepard rips one of the flaming swords out of the creature's many hands as it goes sprawling, and follows up the throw with a slash backed by her full enhanced strength, right through the center of the thing's amorphous mass. Re-form that.

Even if it hadn't been making a respectable attempt to murder Ray and her, Shepard would have defended her actions as a mercy kill, but given the hell the Legionnaires have found themselves in, she doubts the question will come up. In death, or perhaps merely unmaking, the creature melts away, but to Shepard's chagrin, so does her stolen supernatural sword.

"Oh, come on, I wanted to hang that on my wall," she complains to no one as she ducks back into cover, drawing the pistol that she hadn't had time for when the thing had ambushed them. She misses her HUD. "More on the way, Doc. How do you want to play this? I can hold 'em while you make a sprint for the building."