Fortunately it wasn't that bad, the surprising thing is how many times the math was checked.
A very unlikely series of events, but when you roll the dice a million times those things will happen.
More surprising is how well it was handled, I'm not sure what simulators they had at their disposal, but they were later recognized for the difficulty of their decision making and maneuvers, because in simulation other crews couldn't replicate what they'd done (also maybe white washing the whole ordeal)
Admiral Cloudberg did an amazing write-up of this event. She can be found by that handle on Reddit and Medium. I'm pretty sure that article is on Medium by now.
Mentour has a good video on it too, but I'd recommend the Admiral's write-up first