Given that the "prank" was not described, it could very well fall within the boundaries of assault. If so, Virginia does support the use of deadly force under their version of a "stand your ground" law which does not have a duty to retreat.
So, it seems this jackass learned a valuable lesson: don't fuck with random strangers and you won't get shot as a direct result of your stupidity.
"Just take a look around you, what do you see? Pain, suffering, and misery." -Black Sabbath, Killing Yourself to Live.
“Man was born free, and he is everywhere in chains” -Jean-Jacques Rousseau