There's nothing in the script, earlier leaked script or visual script other than what you see in the film;
KAY (CONT'D) Kind of hard to believe it's real. Like - what am I thinking about right now?
ANDERSON turns and gazes at him evenly, determined to show he can't
get to her.
ANDERSON : You're picturing a violent sexual liason between the two of us in an pointless attempt to shock me.
KAY raises his eyebrows.
KAY : You're good. (beat)
But I wasn't trying to shock you. If I'd been trying to shock you, I'd have thought of this.
ANDERSON suddenly winces at the image he had dropped on her. Then -
snaps. She lashes out with her fist. Catches KAY full in the face, and
drops him.
ANDERSON : What are you thinking about now?
Through bloody and busted lips, KAY looks up at her and smiles. He
might be bleeding and cuffed, but the victory in this encounter is
his.
but based on their next encounter, it's reasonable to assume that he was picturing her performing consensual oral sex on him. As to why she found this so disturbing, you need to understand that Anderson's father was sexually abusive to her. She's not especially agitated by the idea of a violent assault, but she's instantly shaken by the implied loss of control.
Judge Anderson : Engram