Lexa remains silent, lingering in the shadow just behind the door as the guard barges in, his attention on Cosima's coughing, his hands full of water-cup.

When Jamie's talking has pulled the guard's focus even more towards himself and Cosima, Lexa strikes. She steps suddenly up behind him, looping her chain around the guard's neck and pulling tight enough to prevent him from shouting for help. A heel slams into the side of his knee at the same time, aimed to take him crumpling to his knees, the better to be subdued more permanently. Normally she'd just do it herself, snap his neck or hang on until his thrashing stopped. But in her current state just holding the chain tight around his neck is taking all the strength she can afford to spend and she's not too proud to take Jamie's help when it's right here to be had.