[The what now. The Soldier looks subtly and politely lost. If this were any other warrior, it might be immediately obvious... but the Winter Soldier was a ghost, it worked either alone or with specified backup with which it was not allowed to form any kind of relationship, and no memories. They have never heard of this bond of which he speaks.

They might recognize it of it were described more thoroughly, because they have experienced fighting alongside people here, but the phrase in particular is alien.

Assuming this is a thing that the Soldier is just unfamiliar with, they accept the premise after a moment and attempt to parse the particulars.]

We would need a common goal to fight beside them, and rules they would be willing to follow if we fought against them I'm a controlled manner. And the means to communicate either one.