I love those handwritten charts! They make the later RM charts seem cold and clinical by comparison. Note that under these rules fully five percent of all 2-handed weapon fumbles involve tripping over the non-existent turtle. With a morningstar's 8% fumble range that means you'd hit this result every 250 attacks or so. That's more often than you'd hit any sort of fumble under the Arduin Grimoire, at least if I'm interpreting Hargrave's rules correctly.
Personally, I love the MERP version of this fumble even more. Check out the last result on this list.
That "You are very confused." cracks me up every time.