Melissa is screaming and crying, and Scott knows there’s nothing else he can do. She’s going to find out eventually; he has this for the rest of his life. It’s part of him. It’s who he is.
When he turns slowly, he can see the horror written across her face.
My son is a monster.
So Scott runs.
Melissa is thinking something else entirely when she sees Scott.
No, no. No, not you too. Your father did this to you. He must have. Who else would bite my baby boy?
And then she fades into the dark, unable to look her own son in the eyes. Knowing she could have been able to help him through this long ago, if only she paid more attention. Scott doesn’t understand it that way, and when he runs, she breaks down in the holding cell.