...Hey, things like that just happen in a dojo ... miscommunications ...misunderstandings, whatever. You did all that you could do, which was to apologize, so just go on with your training and forget it!
...the drop-out rate in most dojos is above 90%, so the odds are with you that they'll be gone soon anyway! And if they take offense at being thrown during kokyudosa because THEY gave their balance away maybe they should consider finding another hobby. Heck, they should have THANKED you for showing them a hole in their technique instead of being offended!