I'm just showing you that the district attorney's theory is a physical possibility.

Let's glance at the landlord's testimony a moment.

When Radnor returned for his horse he appeared angry, excited and in a hurry.

Those are the landlord's words, and they are corroborated by the stable boy and several loungers about the hotel.
"He was in a hurry--why?
Because he wished to get away before the others came back.

He had suddenly decided while he was in the woods--probably when he heard them laughing and talking as they came out of the cave--that he did not wish to see anyone.