Couple of thoughts:
1st
DO NOT ATTEMPT to get in between two fighting pit bulls
unless your prepared to get bitten to hell. I want these people as far away from me as is worldly possible. In the event they threaten my very existence I would support eradicating both parties completely, they are infected with the God virus and this is irreversible.
2nd
Ill bet they knew who the perp was pretty quick. I mean, imagine leaving your head at he scene of the crime. Its so fediddleing disgusting I cant help but laugh at the utmost stupidity human beings so readily display.