Have done few different tests, tied to a pole with approaching stranger,as the clip on YT..
On leash out of his own territory (neutral ground) in the dark, shows defensive behaviour with overload stress, but still moving forward with high raise tail, and minimal raise of hair..
With wire fence between him and aggitator on (neutral ground) he shows much more confidence and deeper bark, as there is a barrier between him and helper...
In the car he displays very serious approach in defense with deep bark..
At home he is extremely territorial, the least we expect..!
The test's were probaly a bit too much, with plenty of pushing to the maximum..
An accidental kick in the nose, between the fence got him sparked up and thinking. Also the car being hit by aggitator, had him thinking and pause for a second or two, then responding with defense..
I raised him to chase moving objects, and has in born prey and hunt drive..
So focusing now on defenseive work, but not so often..!!