She means his alone place, his place of long magic, his medicine lodge. Shell knows where that is and that troubles him. Since his first taste of the higher mysteries, Bandit has kept this most important place, wherever it happened to be, a secret from everyone. He keeps many valuable things there, items of great interest and power. His lodge is protected by magic and in other ways besides, but no place is immune to theft. The fact that he himself showed the place to Shell troubles him most of all. It was a very un-Raccoon sort of thing to do.