What was Bill’s and Whiff’s reaction to the black?

Bill and Whiff were amazed and excited by the black stallion.... yet they ran away unsure.

The Black hesitated when he saw the newcomers. He screamed and trotted back down the field. Henry didn’t have to urge Whiff and Bill to move out of sight. They ran into the barn — their eyes wide with excitement. “Did you see him !” gasped Bill.

“Boy, he’s the biggest horse I ever did see and what a mean look !” answered Whiff. They watched from the window of the barn.