It's only a little shaking. Billy doesn't hit her, so Max will let it slide. It's an improvement on a lot of things. She closes her eyes tight while Billy yells back and shakes her, then comes back just as angry.

"Don't tell me to shut up! I'm not telling you because I think you don't know. I'm telling you I know!" She stabs at her chest, then aims right for his.

"I know who you are, Billy Hargrove. So when I say you were a hero when you saved El, I'm not making shit up, exaggerating or saying it to make you feel better. I'm not ignoring everything you've ever done, either. I'm saying it because I think you are! And you don't get to tell me how I feel about that!"

The information on how little Billy knows about Vecna, though, is sobering. Even the other her.... Fuck.

"Vecna's a person," she shrugs, "or was Henry Creel. Vecna's just faster to say, and he's way more monster than person now."

Max bites the inside of her mouth. "I'll tell you about him. But I need you to hear me out about this, okay? I need you to take me seriously."