runner interference-sliding

[WillyS]

Why is that not interference?
Zoomie, I would have done the same thing. Once the runner is put out, he needs to vacate the base path to allow you to continue your play. He can slide or veer out of the way, anything else is INTERFERENCE.
I play and Umpire ASA Slowpitch. As the BU, I would have ruled interference. If the runner alters your throw, it's interference. Interference can occur a number of ways(Verbal, physical, or just being stupid), doesn't always have to be intentional.

IMHO, your BU blew it.