That wasnt high impact, I have seen a lot of that kind of puppy imprinting. Nice obstacle course.
I have seen Mal pups that age sent to swim across a body of water with fire/smoke pots floating in it with a decoy waiting to give them a bite on the other side.
Heard of another euro breeder that has a lot of high end mals that takes her pups out into a lake in a boat and dumps them over the side so they have to swim for shore.
Such shy animals are in all circumstances an encumbrance to their owner, who must be ashamed of such a dog, and a disgrace to their race. Under no circumstances whatever must they be used for breeding, however noble and striking they may appear.