I shouldn't be helping you guys at ALL, but somehow I feel that I would be blamed if Cooba's map turned out to be wrong. The Enchantresphere's dissappearance was never actually accounted for, so you don't know if there's a rabid zombie there or not. And as for the other rabid zombie, it killed you before you could explore the rest of the tunnel. Who's to say the exit wasn't right behind it?

Deciding that we made the wrong decision heading West, I led the group back East. To the South was the entrance and Save Point, while further West was a passage we had yet to explore.