Shot placement and choice of ammo is as important as anything else when shooting DG, assuming one is using the lowest legal calibre (375H&H).
The idea of using a 375 H&H and upwards in DG territory, even when hunting plainsgame, is a good one. You never know what's around the corner.
Re the Buff charge, I have seen the same hunter and PH combination on the 'Hostile Ground' video, where she takes a good shoulder shot at a white rhino , which then runs off in the opposite direction. She appeared to be using a 375 H&H. The PH puts in two shots with his double as insurance.

M