Maybe this seems obvious to Shaw, but it's new information for Root about how a person very precious to her works, and she holds it close inside. So she does feel anger, if distantly. More like a piece of information than a driving force, and maybe now she's feeling it that way for the first time, a pressure she can't ignore.

Root thinks this over, delicately and tenderly pushes some stray hair out of Shaw's face, tucks it behind the shell of her ear.

"You said I'm your safe place. That you couldn't hurt me. Is that still true?"

She's not looking for reassurance with this, either; she's going somewhere else.