Because it's all part of the act. Part of being a showman. Always on, always performing, always looking to see if even one eye is catching him somehow. Gets trained into you here where unless you shouldn't be noticed then you need to be noticed because it's dangerous not to be. It's a noise the Boneflayers used to make until they realised how often people made it in relation to them so they stopped.

"Avvar dwarves are the height of normal men so they'd be hitting nothing much important when you see how tall the Avvar are," he explains patiently and as if this is absolutely the gospel truth. "Just Kirkwall. Sounds stupid any other way. It's always just Kirkwall, makes you stand out more if you don't keep up. Everything that seems weird or off or not quite right unless you maybe squint, spin around three times on one leg with your right eye covered and a toad in your mouth? Just Kirkwall."