[Morsul the Dark]

Granted I didn’t go line by line of the thread. But a quick search for the word “knocking” shows only one mention of the young Habbits knocking holes in the wall, and is used to show youngsters being more adventurous than adult Hobbits.

Now granted they seem to be youngsters but breaking down walls seems to need more discipline than “hey you kids get out of here!” Which simplified seems to be Frodo’s reaction.