This is odd behavior. Why not walk on the sidewalk or street?
The only explanation (for me) is that someone had informed him that the neighborhood (closed gated community) was peppered with security cameras, thus he'd be less visible if he ducked in and out of doorways, plus the hoodie would offer some means of concealing his identity.
Girl friend said it was because it was raining. However, the young man walking dog and others indicated heavy rain did not start untill after fight started.
Z reported him standing and staring at him (twice) Once with his hand in his belt.