Juvenile Coachwhip?

I have yet to see any coachwhips at this age and with these markings, so I am only IDing these photos due to the snake's behavior. The janitor at my workplace swept this guy into the production area, and was going to kill it until I intervened. I knew it wasn't poisonous, but the way it flicked the end of its take and struck out made everyone else feel afraid of it. When I walked towards it, he coiled up all but the tip of his tail, shaking it like a rattler and raising his head as if to bite. He struck at my boot several times. I picked him up with a t-shirt so as not to cause him injury. Afterwards I took him into the break room, uncovered him, and took the photos that you see here. He was calm and coiled around my fingers. I took him back outside, and released him in the underbrush in the woods. :-) Happy snake. Alive and well now. Education before ignorance is a key factor in conservation.