I think that Lion-san was in the spirit world to tell Asumi how to get out of it. Plus, he still wants to remain in the material world in order to be a "guardian angel/tutor" for Asumi. Which is why he was just hanging out in the spirit world in stead of crossing over the river (he's still attached to something/someone). Also, it was Asumi's fate to lead her mom out of the misery of being stuck in a spirit world, lingering without purpose. If Asumi did not accidentally fall into the river, then her mother's soul would linger on hopelessly. Too bad Asumi couldn't get to draw her mom's actual face... and freak out her Dad and teacher...hehehe ^_^
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