The Doctor - what with his large, brilliant mind - had definitely forseen this problem happening.

"Well, that's life isn't it? Or death. Either way, tough luck. I didn't bring enough oranges and I'm suspecting by the weight of the bag you're carrying that you didn't either." The other option he supposes was to run back and forth from the outside of the cemetery and back in but then they'd never get to the end. "Someone else will come by with more. I wouldn't be too concerned about it."

He's spun around to walk backwards and talk to Link but it's clear that he isn't going to wait for Link.