This dog is very worried. His owner is learning how to fight with a sword (actually, it’s a rapier. They have no edge, just a point and originally they were used as dress swords).
The problem is that the dog doesn’t understand what’s happening. He’s looking at his owner and not at his owner’s opponent.
Sword Fighting: Vancouver, BC
I wouldn’t be surprised if they were learning/practicing for some kind of theater/play (there is so many movies/tv shows made in Vancouver). The guy must be “not too bad” because usually people learn with wooden swords before “graduating” to actual swords.