He was as still as a dead mouse.

There was no earthly reason why the creature should not come out, except perhaps that it might not want to come out.

At any rate, it could not know that Harry was outside waiting for it.
He waited a long time without ever thinking how the day was passing on; and it began to be a little darkish, just a little, before he thought that perhaps he had better go back to Kate.
But it might be just coming out, and what a shame to move! A skin that would bring five dollars was surely worth waiting for a little while longer, and he might never have such another chance.

He certainly had never had such a one before.
And so he still sat and waited, and pretty soon he heard something.

But it was not in the hole--not near him at all.