The S-300s can be fired at ground targets (Russia does it routinely even as they're really poor in that role with very low accuracy) but it was a missile that missed.

21 years ago, an Ukrainian S-300 killed 78 Israelis and Russians by human error during joint Russian-Ukrainian military exercises.

And 5 years ago, a Syrian S-300 crew killed a bunch of allied Russians thinking they're Israelis.