txinvestigator wrote: Leaving the scene will get you tossed in jail and make it very difficult for the authorities to believe your story. I will go out on a limb and say there is a 99% chance of your being tried and convicted if you just leave the scene.
Leaving the scene might sometimes be necessary to avoid further danger, so "leaving the scene" is not itself a one way ticket to jail.
Contacting the authorities is mandatory IMO, and of course... stay at or near the scene if circumstance allows.