Yelena's anticipating trouble, prepared to alter course on a dime once she catches attention, and that coupled with reflexes honed over the course of a lifetime allows her to drop into a roll that avoids most of the grasping wires.

Most is not all, however, and several loop around her left arm as she comes up again, arresting her momentum with a jarring wrench that forces a hiss of pain through her teeth. Unseasonably dressed in heavy leather as she is, there's not a lot of skin to root into, which leaves her scrabbling to wrench the coils free in hopes of preventing them burrowing.

If she can't get loose, she's in deep trouble. Then again, if this particular trap is focused on her, that at least leaves Cortana and Elidibus no worse off than when they'd started.