JOHANNESBURG, SOUTH AFRICA — The final day of the NBA’s four-day Basketball Without Borders Africa camp culminates with an All-Star Game featuring top campers from countries as disparate as Cameroon, Nigeria, Zambia, South Africa, Tunisia, Angola, Egypt, Congo and others. These budding African basketball stars are killing each other on the court at the behest of their NBA-affiliated coaches, the Grizzlies’ Lionel Hollins, the Hornets’ Monty Williams, and a collection of scouts and former players serving as assistant coaches, such as Dikembe Mutombo, Patrick Ewing, Alonzo Mourning, Dee Brown, Jeff Hornacek, Bo Outlaw, Milt Newton (Wizards), B.J. Johnson (Rockets), Mark Hughes (Knicks), Marc Eversley (Raptors), Noel Gillespie (Suns) and Harold Ellis (Pistons).