When I got my first jagd some people in my home town saw me with it and they always said something like, " holy hell them things are terrors!" Of course none of them ever worked their dogs. When people come in my house they think that Blue is 8 years old, she's 2. In the field is where people say " holy hell she's a terror, glad I'm not a ____"

The intensity of these dogs is just fun to watch.
And you are speaking about Red, Darwin's sire. I have seen red kill lots of things and he is good at it. I thought he was 1/2 greyhound 1/4 airedale 1/4 pit. He was put over a 1/2 staghound (american type not 'scottish' breed) 1/2 airedale bitch, to make a litter of 1/8 pit 3/8 airedale 1/4 greyhound 1/4 staghound.
Darwin is much bigger than red, 2.5 inches higher at the shoulder and hip, longer with a heavier coat that is short and wooly and quite warm, thicker hide and bone structure, probably not as fast overall but Red is much faster on the jump.
He kills very fast, the terriers don't get hurt much anymore, but his primary objective is the safety of my 100 pound wife. He is a good boy.
Justin