He listens, quietly, brows furrowing slightly when she starts, and drawing together much more sharply when The Bitch is brought up. Heather's feelings about the woman are not alien to him--outside of possibly Wrath and Henry, he doesn't think there is a single member of the household that wouldn't like to see her eviscerated and roasted into ashes. And the way that Heather describes this other woman...

"Yeah. It does." He straightens a little, turning to face Heather properly now. "What did she do to you?"