Though he was peripherally aware of the arrival, it was only once his hands had been pried away and the pain dropped sharply that Ben could clearly see and be certain it was Eve. There was relief and anxiety all at once; relief that his action had worked and brought her here, no matter how pissed Cas might be at what he'd done, and anxiety that it had done nothing, that nothing would have changed and even her touching the sword wouldn't end with her believing them.
He just need someone to believe them.
And while Castiel's hand was on Ben's shoulder as Ben watched, wide-eyed, at Eve's reaction, the bulk of the 'staying' rested with the way Ben was leaning heavily against Castiel's side. He hurt, but it was the sort of hurt that came from intense pain fading and the body needing more time to readjust to pain receptors now freed, so while it would fade out soon enough, for the moment he was still.
And watching. Waiting. Hoping and bracing, all at once.