Steve's mouth tightens; it's not quite a frown, but it's close. Mostly, he's worried, and he doesn't like what he hears, particularly coupled with what he sees.

"Did it start at the same time you noticed the, uh..." He motions to Winter's hands with one elbow while he pushes the guns into the bag with the broom, careful not to even let them bump Winter's boot on the way in if he can help it.