*Warning: Spoilers ahead*
On the last episode of This Is Us, we saw Randall (Sterling K. Brown) begin to crack under pressure, Kate (Chrissy Metz) and Toby (Chris Sullivan) reach a compromise and Kevin (Justin Hartley) and Rebecca (Mandy Moore) have a little fun. This week, we finally got to see what causes the long-awaited Randall and Kevin blowup—and it’s definitely not pretty.
At the top of This Is Us season four, episode 16, Randall tells Kate and Kevin that he found an experimental treatment that could help with Rebecca’s memory loss. The catch? It’s nine months in St. Louis. Randall wants to tell Rebecca right away, but Kevin begs him to let her have a fun time at his premiere (looking like a young Helen Mirren, we might add) before they make her decide. The night goes great until Rebecca has a moment of forgetfulness and Randall decides to go against Kevin’s wishes and tell her about the clinical trial.
When Kevin notices Randall telling their mom about the trial, he rushes over and calls his brother out. Rebecca gets overwhelmed and steps out for some air and Randall and Kevin take major digs at each other. When they go to find Rebecca, she’s gone but they know where to find her: The Met. They’re cordial in front of Rebecca but Randall and Kevin don’t make up.