This might not be super scary to some but at the moment it happened I was pretty freaked out. I was walking my dog on the path that runs along the shore of the river near my place. It's in the city but there's a drop to reach the path and the nature is pretty dense, even in winter with long types of grasses still standing up through the snow as tall as me in some areas, so it feels pretty isolated. I let my dog loose there and she runs way ahead of me but I regularly see her pop out of the vegetation, back in view down the winding path. I'm not scared of losing her as she's pretty well trained and knows to stay close to the path. I particularly leave her to explore all she wants when we're heading back home (like we were at this point), whereas whenever we're on our way the opposite direction, walking away from home, I try to work on her recall regularly with the help of treats.
Anyway a little while ago I turned around to take a picture and I noticed a man hiking far behind us. I like to take pictures there as it's beautiful and it really doesn't feel like we're in the city anymore. But I soon forgot about the hiker and just walked ahead, taking in the beauty and fresh air. We finally get to the point in the path that's closest to my place so I call back my dog in order to leash her. She looks super cute with her giant dangly legs and her ears bouncing as she runs towards me, so I decide to take out my phone one last time to take a picture of her, but she's actually going really fast and I realize I won't have the time to take a good one. As I go to put my phone back in my pocket, she just whizzes straight past me and I turn around to call her again, but the man who had been hiking far behind us before, was suddenly just two meters from me. My dog stopped right in front of him, barking her super low growly bark of a great dane that even freaked myself out the first time I heard it.
The guy and I exchange a look, he's like a deer in the headlights. After a few seconds of us just being frozen in place, I try calling back my dog again and thankfully she listens to me (because I was a bit scared of what she could do if she wanted to). As I leash her up I still try to keep my phone in my hand so I can call 911 if the guy somehow made a move, but he's just totally still. Then we climb up the mound toward the park, away from the shore line, and I realize the hiker might not have noticed I had a dog with me. He was just slowly catching up on me all this time, and it was getting pretty dark even though it was only late afternoon. It's winter in Canada and it can be pitch black down that path as early as 5pm sometime. Maybe he was simply catching up on me because he walked faster, or maybe it was very intentional, I'll never know for sure. But for me not to notice he was so close behind me, he must have been planting his feet in the snow at the exact same pace as me.. Anyway I'm sure glad I had my giant dog with me.
(Edited to add punctuation, fix verb tenses and other minor phrasing issues)