I do have a sort of movie playing in my head, but it’s not really a visual or auditory experience. It’s more like a running list of bullet points; a stream of facts. Visual descriptions are chock full of these facts, but they’re all usually inconsequential to the plot so I tune them out.
I find aphantasia very strange. I don’t lack a mind’s eye, but I do lack the ability to use it while conscious. My dreams are extremely visual and movie-like, but my conscious experience isn’t really visual at all. It wasn’t until recently that I learned “day dreams” are named that way because for most people they resemble dreams, but mine don’t at all.
I imagined what you said, but my thought was focused on the ball, and so the person was "unfocused", or "not as detailed" - I'm not even sure what gender they were.
Oh, and I'm colour blind (which is relatively common), so probably don't think of colours in the same way as others.
The aphantasia test: imagine a person rolling a ball across the table.
What color was the person's hair? If it didn't occur to you, you may have aphantasia.
(This ability, I assume, is key in reading books. It's like an ongoing movie in your head if you can do it. I can't.)