This he could not enjoy now.

Might not his mother ask him further details about his walk?
So he said that he preferred to go to bed right away, and his mother understood that he was glad to get to rest after running about so ceaselessly.

Only when Kurt lay safely and quietly in bed could he think over what had happened and how cowardly he had acted.
After all, his mother had clearly told him that there was no ghost in Wildenstein.

Whom then, had he seen in armor and helmet and with a long mantle?
It could not have been Mr.Trius, because he was a short, stout person, whereas the apparition was a tree-high figure.

Might it be a sentinel at the castle who was ordered to go about?
May be the old castle-barons had always wished an armed sentinel to keep watch.