Those long, stalking strides. Heheheh.
Spoilers
Also, they finally off him at the end of 2... so what happens at the start of 3? A new one simply appears, gets rid of the corpse of his predecessor and continues where he left off. That was absolutely brilliant and terrifying - kind of like when the Ginosaji breaks his spoon... and drops it... and for a moment it's like 'omg, maybe he's gonna stop'... and then he opens his coat and oh no, oh no, oh no...