KAOLACK — Here on the banks of the Saloum River, the name of Cheikh Fall is almost forbidden. It sounds like a demon, not a human. “In any case, no one knew him, no one knew him,” people whisper in Kaolack, a town in western Senegal. Locals are afraid of being associated with Cheikh Fall. “Even if someone did know him, they’re not going to say anything,” says Babacar, a local electrician. This is a story of an existence denied, a memory erased, and a line has been drawn under the effect of visceral hatred. To mention him is to run the risk of seeing faces decompose and dialogue shut down. Frow…