Ellie doesn't really keep an eye on William, either. Maybe the guy's sensitive. She has enough shit to do without worrying about some old man's feelings.

After a little while, though, William may notice her looking at him from across the fire. Or, well, if he's particularly observant, he'll notice she's looking just to the left of him. She tilts her head to the side before pulling the bow off her back and drawing an arrow.

If William doesn't move, it'll fly right past him and hit a chert right between the eyes.

If William dodges to the right, the same will happen.

If William dodges to the left... oops.