When I've written episodes of 'Doctor Who', when it comes to...

When I've written episodes of 'Doctor Who', when it comes to the monster chasing somebody, it's the Doctor and the companion, running down the corridor, being chased by a guy with a stick and a tennis ball on the end. Whereas, when I see the rushes of 'Being Human', we're actually looking at the werewolf, and it just looks real.