Andy - 100%
When we left off, Andy was making her way down the stairs just as the explosion went off. She was distraught over Jack's voice disappearing from the radio, but she was a few floors down and will most likely make it out. Let's face it, even Shonda isn't about to kill off Station 19's Meredith Grey. We're giving her a 100% chance of surviving.
Ben - 99%
Ben was facing an incredibly difficult decision when we last saw him. Will he save fellow firefighter Montgomery, or civilian Molly? Whatever he decides, Ben himself was uninjured and not in immediate danger from the fire. He was still in the building when the explosion occurred, but probably on one of the lower floors by that point. Plus, he's the connection between Station 19 and Grey's Anatomy, so he's not going anywhere.
Maya - 90%
Maya and Vic separated when Vic volunteered to stay back in order to give Maya and the civilians she was saving more time to escape. Chances are she made it out safely, but since we didn't actually see it happen, we can't be completely sure. Still, we believe her odds of survival are fairly high.
Victoria - 85%
Vic was incredibly thankful when Maya volunteered them for the safer job, but it didn't turn out to be quite as safe as they expected. When the fire started jumping floors, she faced her fear and stayed behind after sending Maya out with the civilians. It would be a tragic coincidence if the moment she got over her fear led to her death, so we're pretty confident she'll make it out.
Miller - 75%
Miller was trapped in an elevator with an unconscious patient when we last saw him. He didn't appear to be in any immediate danger, but he was still trapped in a burning building on the verge of collapse with no means of escape. His own guilty conscience could impede his ability to think straight. We think he'll make it out, but it's not a sure thing.
Molly - 50%
Poor Molly. She took her job very seriously and made every effort to ensure everyone's safety, and how did they repay her? By trampling her in the stairwell, that's how! Ben came across her while trying to get Montgomery out, but he can only save one of them. What will he do? Molly is an expendable character, but Montgomery told Ben to save the life he can save, so we're assuming he does exactly that.