Primus nods and grabs his things immediately, heading back even faster than he came. There would be better times to play in the logs, especially if Buddy was having anxiety issues right now. He can't help but worry he says, because every time the void DOES go quiet, it seems to mean somebody's hurting or going to hurt- first with Buddy being in pain, and now something scary at the treehouse? It worried him.
You explain to Dad and Primus that you didn’t create the knife intentionally- you made treasures and puzzles in the world without a whole lot of description, and the void must have filled in the blanks. The other option is, well…something else is making things.
Primus accepts the void's explanation of what happened, and says he believes it in that it didn't mean to make the knife. He just hoped that whatever did, he said, if SOMETHING or SOMEONE did make it, that it had good intentions.