What if Frank gets patched up by her, too? And it's the first time he's required her services since Matt told her about their relationship? And she just stops stitching him up for a minute and starts using her scissors to point out exactly where she would hurt him, and exactly what effects she could cause, if she ever finds out that he hurt Matt.

Frank's torn between cold terror and gladness at the fact that Matt has someone this strong in his corner.