what made will change his opinion about his father

Rounding the corner, the Dust Witch approaches, waving her fingers through the air, sensing truth and lies and the colors of souls. As she approaches Charles and the Illustrated Man, she exclaims, "why there's Mr. Dark and... and old man... an old man." He's not that old! Will cries to himself. She stops above the storm drain and appears to sense something below. Thinking quickly, Charles talks about his cigar and blows smoke at the Dust Witch, which distracts her. Mr. Dark asks for Charles's name, and he responds honestly, adding that he works at the library. Then he follows the Dust Witch out.