Updated: May 1, 2020
Impala are the first to indicate the presence of a predator - in this case something behind the tourist safari vehicle. Not surprisingly, as that part of the country for some reason has the highest concentration of leopard anywhere in Africa - and maybe of lion as well.
Photo kindly shared by Londolozi.
Talking about inserting... look how that male inserted the females between him and the threat! Survival of the genes.