Team Kenzi! Keep alive was the goal, and those demons were nasty - Natasha really didn't want to see one again, ever, after this debacle. It was also messy, and Ruby hitting home runs meant that the spray of gore was also impressive - not to mention the smell from the effects of her Widow's Bite weapons, zapping those ugly things until they were a charred mass. It began to creep in and become so awful that she just ignored her sense of smell entirely; no need for it now.
Not wanting to run out of juice, she removed a knife from her belt and went at them the old-fashioned way. Dodging dead demons, lying on the ground, she was a blur of acrobatic moves and finesse, slitting throats and puncturing what she hoped were vital pieces within them. The demons got their hits in too, and Natasha wasn't indestructible - but she was determined enough, just like the others.
The scratch of claws and sharp gnashes of teeth weren't enough to deter her. When she maneuvered closer to Ruby, she handed the woman another grenade, with the pin still on. "Here, try this if you need to knock a bunch back." Less chance of squashed skulls causing brain matter to fly right in her face.