The sample size is so low you can't get any meaningful results. And use of violence against a guard or breaking prison materials is still illegal (since it's illegal to use violence against anyone and/or to destroy property). But if the door is left open and you walk out without harming anyone, that in itself is not illegal.
I'd guess that that person, not being at that point of time a "detainee", would get the outcome of the other laws related to "resisting arrest" or something similar (like when police wants to do a check on you and/or your vehicle, etc... and you run off).
