Most of the time ひ is pronounced "hi" but in the case of ひと and ひとり something odd seems to happen with the pronunciation of ひ. It gets pronounced a bit like し but not exactly like し. What is happening here with the pronunciation? Is there a lesson somewhere on JapanesePod101 that covers it?
I'm finding it difficult to imitate the sound. If you said ひとり but pronounced the ひ like "hi", would you be understood by a native Japanese speaker?