Exactly.

[Tony knows that he's putting a lot on Bucky's shoulders. And he also knows Bucky is tough, he can handle pressure. It still doesn't make him feel very good about it.]

Because she might get in over our heads. I think everyone here for the most part wants to help. But we're dealing with an enemy that's done nothing but try to catch us off guard this whole time. If we don't keep track of each other, he might actually manage to do that.