Hmm. I'd say off slow ball if it goes to Farrell it's because he's going to kick it.
I'm not saying he can't run the ball, but I don't think he's a better straight line carrier than other players we've tried there. Maybe marginally better than Slade, who is the physically weakest option we've used. Farrell doesn't have the sheer power or acceleration in contact to turn slow ball into front foot ball - my view of him as a runner is that he can pick a good line when the play has already sped up.