Interestingly I recently read a travel report article in a German flying magazine, about a German guy flying down under (also New Zealand) on his vacation.
At one instance, when he began to slip his plane down onto final as he was coming in a bit high, the NZ safety pilot he had along apparently got into a light panic and took the controls from him, saying something like "we don't do that here, never ever!"
If that is true it might explain why the guys in this video crab in like that. Beats me what's to say against a good slip, though...