If she were hurt in any way, if she'd been hit by a bullet or a fist, she would tell him. John trusts Karen, not only with his life and safety, but to know what's most important to him, which is always her. He won't make the same mistakes he's made before, he won't lose more people he loves to senseless violence.

If Karen was hurt, he would know. And he would end this.

But she tells him to go and so he does. Moving toward the right, he puts himself against a wall, then peers around a load of boxes. A shot rings out from somewhere down the hall, but it's too dark for John to see who's holding the gun. He fires back, unable to tell if he's hit anyone or anything, mostly trying to give himself and Karen time and cover to head around the next set of boxes.