His hearing is amazing. That comes with being blind and being a Stand user. He can hear you run around, trying to distract him as the rest of the Joestar group gets to safety.

And, eventually, you stumble upon N'Doul himself. Something stops him from hurting you. It's this weird pull that makes his sightless eyes ache and heart pump.

"Hello there." Voice like honey, N'Doul greets you. He won't hurt you; you've made him question his loyalty. How charming.