For most of the episode once she found out about their history, Vic was Team Montgomery over Team Theo, which made sense for her character.
Spoilers ahead for Episode 8 of Station 19 Season 4, called “Make No Mistake, He’s Mine.”
So, the end of the episode with Vic softening toward Theo and being caught in the act by Montgomery was a twist that I really wish could be un-twisted.
Station 19 lightened up on the trauma somewhat this week with Carina on the road to recovery from her brother’s death and Dean moving forward with his lawsuit, but the Andy/Sullivan drama continues, and the show complicated Vic’s new relationship by revealing that Theo is the Seattle Fire Department captain who got Montgomery’s husband killed.