There is a second Li in Li's cave. I let Li here by interacting with the helmet, then interacted back to have Li back with me. When I went out of the cave, Li was swimming in his diving suit while Li was following me in his underwater form. I can send the screenshot by mail if you want it, since I have not uploaded it and can't show it here.
It is not a critical bug, but it is kind of... strange.
