Jean Smart and Hannah Einbinder are in a blame game.

“It’s you” … “No, it’s you” they quip back and forth, as Smart points a finger at her Hacks costar.

The debate they’re currently engaged in is over which of their characters — Smart’s Deborah Vance and Einbinder’s Ava Daniels — was shadier in the Emmy-winning comedy series’ gasp-inducing season 3 finale, where Ava blackmailed Deborah after the comedy legend lied to her about why she couldn’t be the head writer of her new late-night show.

“There’s an argument to be made that it is worse when someone who is more innocent turns bad,” Einbinder explains in the video, above, where the actors and costar/series co-creator Paul W. Downs recap the show’s first three seasons. “Because Deborah you expect that behavior from…. So perhaps it is sadder and thus worse that Ava has that turn.”

Downs plays devil’s advocate, wondering if Ava has created her own misery by “handcuffing herself to Deborah” as she tries do do “what’s best for the show and thusly best for Deborah too. So maybe it’s partly selfless, even though it’s also ambitious and selfish.”

His argument has won over Einbinder. “Perfect. It’s Deborah,” she says, deadpan.

But Smart is quick to defend her character’s actions.

“No, no, it’s Ava, because she’s taking extremely personal information and threatening to make that public,” the Emmy winner states. “There’s nothing worse than that. Nothing worse than that.”

But, “she wouldn’t have done that,” Einbinder retorts, “if she wasn’t lied to, you know what I mean? Feels like she had a reason.”

“Nope,” Smart says. “It’s you,” Einbinder replies, as Downs listens, smiling as his costars have a fun back-and-forth before quietly requesting, “Please, don’t fight.”

Sign up for Entertainment Weekly‘s free daily newsletter to get breaking TV news, exclusive first looks, recaps, reviews, interviews with your favorite stars, and more.

The action in season 4 picks up minutes after the season 3 finale, where Ava plays her cards: “You wouldn’t,” Deborah says, stepping within inches of her young writer’s face. “I would,” Ava replies, cocking her head. “Wouldn’t you?” Gulp. And from there, the two have to figure out how to work together amid their animosity and anger, as Deborah’s dreams of hosting her own late-night show inch closer and closer.

But what got them there? Some trepidation, some laughs, a slap, some vulnerability, a funeral, a revealing email, a lawsuit, an enormously successful comedy special, a roast, and so much more — as the three detail in the video recap, above.

The first two episodes of Hacks season 4 premiere Thursday, April 10 at 9 p.m. ET/PT, on Max.