Advice needed for Doc about funny criminal accident

So there was a funny criminal accident in my city, in my street to be more precise. Police arrested a thief and while they were filling documents, preparing to drive him to police departament, he managed to steal automatic gun from police and ran away while in handcuffs, he used public transport to reach his friend which helped to cut handcuffs. Long story short he was caught, no one was hurt. But it was quite funny accident.

So, since, im interested in doc directing. I tough that this could be a good story for a movie. But the question is how i can extract Idea of the movie, from such a story? Is it even a good way to approach a documentary film from story first, but without no core idea about what it is.

What would be you toughts? Ideas?