i have seen the video before, and i gotta admit, i was surprised and impressed. keep in mind, ft lbs or joules of energy do not necessarily kill things, long holes thru vitals kills things.
shooting a cape buffalo with a 10mm is a bit of a stunt, however, koromojo bell shot them with 7mm solids out of his beloved 7x57 all the time. and had no backup, and did not appear to feel concerned about doing the deed.
archers kill cape buffalo with sub 100 ft lbs of energy all the time. with an arrow it is about the methodology of the broad head. still, not much energy hitting the animal.
a 10mm/40 cal is larger than a solid 7mm or 375 bullet as well. and close to the diameter of a 375 barnes bullet i saw pulled from a buffalo. don't misunderstand me, i don't think the 10mm is a buffalo gun, shooting a buffalo with one is a bit of a stunt, i think long term, if one hunted buffalo or lion with a 10mm handgun with no backup (like 5 hunts) something would go bad and you would end up in a hospital bed/or dead.
i think tracking lions and shooting them with a bow is the same kind of stunt. a bowhunter without back up will not survive 5 hunts of that type on a lion. the lion will turn and kill you before he possibly dies of his injuries. so, kind of a stunt in my mind.
also like some people shooting very small calibers at dangerous game, a stunt.
as mr hobbs proved once again....shot placement is everything.