Oh Mrs. T. You see, fibromites have a distorted sense of perception and often times mistake an orange for a soccer ball and vice versa. Our eyeballs sometimes roll around in their sockets giving us the illusion that things are in motion when they really are not. It's really quite common to think a regular house cat is a mountain lion...or bobcat, as the case may be. You are not an idiot, my dear. I have often times looked quickly at the hubby and thought he was wearing a dress, when in fact it was just the ugly bathrobe his sister gave him for his birthday many years ago.
Furthermore...you are a wonderful person for trying to save any cat that was stuck...bob cat, Cat Stevens, Cat on a Hot Tin Roof...and digging a trench? Bravo! I'm proud of you!