Yelena makes a split-second decision to meet aggression with aggression. She uncoils into Katie's lunge and bringing the knife up in a short, brutal arc that angles the blade beneath where the shadow woman's sternum should be if she retains anything like human anatomy, in hopes that their combined momentum will drive it home into heart or lungs or major blood vessels. At the same time, she pivots, sweeping her back leg to tangle with Katie's and send them both tumbling.

It doesn't leave much left for defense - she'll shield her throat and face as best she can with her off hand, and hope the heavy leather jacket she's laid claim to in place of her preferred tactical armour will afford her some protection from those raking claws.