Don't know what kind of shotgun lets a robber run off yelling. Maybe it didn't have time to visibly bleed ?
If a shotgun like my 870 w/21'' barrel turkey gun shot him it would be a totally different outcome.
A 3'' hevi-shot of #4's, >over with. 40 yard pattern the size of a big dinner plate.
Why would you waste any Hevi shot loads on black guys 4 buck and aim higher.