It could be a number of reasons. You guys reacted the best way possible. Staying calm and slowly keep moving.
Bolting, screaming, jumping, are the worst ways to react. The dog may not be exercised enough, which can lead to aggression. It may still consider you in its territory even if you were out of its yard.
The dog may not be socialized or so it feels threatened and anxious of people. Any number of things really.
Because that's what dogs do when their owners fail to supervise and contain them.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.