(Warning: The following contains MAJOR spoilers for Yellowstone Season 5, Episode 10, “The Apocalypse of Change.”)

Luke Grimes told TV Insider ahead of the premiere of YellowstoneThe final season in which the fate of John Dutton (Kevin Costner) forces Kayce to choose a side in the civil war between his siblings. The second episode of Season 5, Part 2, showed just that. Now Kayce is even more devastated than before, leaving the military veteran in a headspace where Monica (Kelsey Asbille) and Tate (Brecken Merrill) are on high alert.

Before his father’s death, Kayce never saw Jamie (Wes Bentley) as an evil force like Beth (Kelly Reilly) always did. This perception was completely shattered after Beth confronted Jamie about their father’s death on the November 17 episode. Jamie couldn’t look Beth in the eye as she demanded answers in his office, and he wouldn’t deny Beth’s accusation that he had a hand in their father’s death.

Beth didn’t believe for a second that it was really suicide, and Jamie couldn’t prove otherwise. A cowardly silence was all he could muster. This, combined with Sarah’s (Dawn Olivieri) sinister reaction that caused Beth to throw her to the ground, was all the confirmation Beth needed to know that Sarah and Jamie had killed John. Jamie didn’t reveal the truth that he was kept in the dark about Sarah’s assassin plot. It could have come from deep feelings of guilt that even though he did not order the attack himself, it was his idea.

Kayce was the first person Beth called after this brief but violent encounter. Jamie’s refusal to deny his involvement sent Kayce into a dark spiral; he bit his lip so hard he drew blood. Kayce accepted the grim reality and responded that Jamie could not have acted alone. Then Beth told him about the “viper” Sarah.

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The former Navy SEAL cleverly surmised that Sarah must have hired a hitman to do the dirty work. He called a fellow veteran (played by Will Trent‘s Jake McLaughlin) on a secure line asking about American assassins. Monica and Tate followed in the car behind Kayce, concerned for his well-being. In grim advice to her son, Monica hinted that Kayce may be triggered and prone to self-harm.

‘If your father becomes quiet, you talk to him. When he is alone, you force him to be with you. We can’t let him be taken from us, Tate,” she warned.

Earlier in the episode, Kayce promised that he would take John’s place as head of the ranch if Tate wanted to do the same in the future. He wouldn’t hesitate to keep the ranch if his son wanted it. A flashback showed the family of three renovating their cabin on the family’s land and feeling at home for the first time. In the Texas timeline, Rip (Cole Hauser) revealed that he had never left Montana before, and Beth regretted being so closely tied to the ranch. This allows the series to set up a series finale in which Beth and Rip leave Montana and Kayce and Monica take John’s place as the ranch’s caretakers. But this revelation about Jamie could be a major obstacle for Kayce.

Jamie, meanwhile, has come to terms with Sarah, despite the obvious despair he feels about what their actions have led to. The only thing he can think of now is to finish what he started and what his father opposed. Jamie plans to reverse John’s termination of the airport lease, and Market Equities will support his bid for governor in the upcoming special election. But Beth and Kayce won’t let him win without a fight.

YellowstoneSunday, 8/7c, Paramount Network