Mirroring each other

As I've mentioned before, Loðvík has a "frenemy" who lives next door.
Most often he's very afraid of Nemó, but sometimes he tries to guard his territory and act confident. Today when I came home from work they'd been having a staring and hissing competition for a while and difficult to see who was winning.
I just hope they won't get into a big fight and hurt each other....

Extra photos for context.