The fact you put Ngannou in the same example as Hendo shows very little thought has been put into this even if your heart may be in the right place.
In their first fight Ngannou hit Stipe with some bombs and Stipe didn’t go down. In the second fight Ngannou rocked Stipe like twice before the finishing sequence, Stipe even managed to hit Ngannou with a solid punch after getting dropped. So it’s totally plausible to think Ngannou landed a those follow up blows in the heat of the moment because he was fighting a legit HW great that refused to go out.
Very very different to what Hendo did to Bisping and other opponents.