Probably not quite as close as you may have thought.
If you were "about 10 ft from touchdown" and there was another plane holding in position on the runway for departure it would have been too late for you guys by the time you has descended that low.

My guess is that the plane that landed ahead of yours wasn't able to clear (exit) the runway before your plane was about to touchdown, this happens fairly often at busy airports. Normally only one aircraft is allowed to occupy an active runway at a time.