“Chicago Fire” had us on the edges of our seats Tuesday night with Season 3’s heated episode, “Just Drive the Truck.” Although episode 3 started on a stressful note (with the brutal collisions of trucks 81 and 61) it ended on a light-hearted one as Molina (the injured driver for 61) found the strength to survive, Gaby (Monica Raymund) found a position on 81 and Peter (Charlie Barnett) looked for the silver lining and found a paramedic gig.

Peter was diagnosed with vertigo in episode 3, which meant he would be unable to perform the everyday tasks of a firefighter.

“I’m a firefighter. If I’m not that, then what am I?” he asked after the doctor revealed he couldn’t clear him for squad duty. But Peter found a loophole. Because Gaby was promoted to candidate that meant her former role as a paramedic would be available for him to snag.

However, according to the synopsis for episode 4, “Apologies are Dangerous,” Peter will find it difficult to not slide down the pole with his brethren when the alarm goes off. “Mills must come to terms with a future that doesn’t include the squad,” the summary teased.

But Peter won’t be the only one trying to settle into his new role. Gaby will start her first day as a candidate under her fiancé, Lieutenant Casey (Jesse Spencer), in episode 4, and they will quickly learn that trying to find a balance between their personal and professional lives is harder than it seems.

But episode 4 will mostly focus around Severide’s (Taylor Kinney) storyline -- and it’s a scary one at that, especially for those who use mass transit on a regular basis. According to the summary, “Severide will confront his demons in an unexpected way” in next week’s episode. Poor Sev is still mourning the death of his best friend. But his grieving will have to be put on hold when a disaster strikes.

The promo video teased that Severide will find himself smack in the middle of a train shooting in episode 4. And at one point, he’ll even have a gun being pointed point blank at his head. Poor Severide -- he just can’t catch a break, can he?

What do you think will happen in episode 4 of “Chicago Fire” when “Apologies are Dangerous” airs Tuesday, Oct. 14, at 10 p.m. EDT?