Chicago Fire frames its finale with an incident that has Herrmann (David Eigenberg) wondering, “What the hell was that?” as the ground shifts beneath him, Kidd (Miranda Rae Mayo), and others. And then the episode goes back a few days before. So, how does it end? Well, let’s just say 51 could very well be about to lose a major member. Warning! Spoilers for the Chicago Fire Season 14 finale ahead!

First, 72 hours earlier, Herrmann, after “venting,” as he puts it, about the construction on their new house, surprises Cindy (Robyn Coffin) by getting down on one knee. “Are you having a heart attack right now?” she asks. No, he’s proposing, wanting to renew their vows after all they’ve been through and to celebrate the fact that, after 32 years of marriage, they’re still in love. It’s sweet. It has us worried.

Back on the incident, Kidd and Herrmann realize the roof is about to collapse and they shouldn’t vent. It’s a rush to get back to the ladder. Kidd’s the last one on the roof.

And 58 hours before that, Severide (Taylor Kinney) is pondering his future while in bed with Kidd. Does he take the OFI job, which some would say is his destiny? Or does he stay at 51, his home? He has three days to make his decision, and he hasn’t told anyone about the official offer. Also with a decision to make? Vasquez (Brandon Larracuente), whose father insists he meet with PD’s training commander.

After catching up with the firefighters at the incident, 36 hours earlier, Severide goes to a meeting at HQ, surprised to find Pascal (Dermot Mulroney) waiting for him. Pascal was brought in by the fire rescue division to ask him not to take the OFI job. He’s not back at CFD — he doesn’t know what the department has in store for him — but he did leave Severide in the leadership position at 51. Severide assures him that OFI is the only place he’d consider going, considering his and his father’s history there. But wherever he ends up, Pascal tells him, he’ll be a captain; his promotion went through. He’s also sticking around. As he’s debating what he’s going to do, Isaiah stops by for a visit.

As Cindy comes up with a theme for the vow renewal, while working with Violet (Hanako Greensmith) and Novak (Jocelyn Hudon) — gratitude — Mouch (Christian Stolte) learns that the publisher is interested in his book, but not Brothers in Arms. They want the first one, the one without Herrmann, or so he thinks. During a meeting, he finds out they actually want Sheets on Fire, which he’d written under a pen name nine years ago, because romance is very marketable. Between this, what’s going on at the incident, and the vow renewal plans, we’re even more worried about Herrmann.

After briefly catching up with the firefighters at the incident again — it’s really smoky, and it looks like squad comes across something… 18 hours earlier, Cruz (Joe Minoso) and Chloe (Kristen Gutoskie) find out they’re having twins!