Exactly. The dog was most likely confused. Where’s my owner gone? It was just doing it’s usual walk.
I also have a sensitive dog and she can behave erratically. For example when my husband and children leave to go on a bike ride and I stay behind she watches them leave, sees them go out the gate. Does she sit at the gate? Does she wait at the window? No. She paces four or five times, back and fourth the length of our house, showing obvious anxiety. Even though I am home, I’m sat there in the house with her, next to her, I am oblivious to her. She’ll only do this for literally a minute or two, then eventually settles. i just don’t think she likes them out of her sight. So for me the dog running back and forth was just her waiting for her owner/anxious on what to do/ waiting for an instruction.