Sofar it is just this one person and it has happened twice since i have been there and i have been there two months. I do not want this to blow up. It is their frustration for me and not mine that caused this person to say
For me personally if it only happened twice and I was not completely clear what or why it was said I would let it go. Maybe they were mad at themselves for taking a bad fall...I've done that many times.
If you think you need to address it then I would follow Mary's advice and deal with it now. If it is bothering you as much as your posts indicate then I think you are just going to be stressed out waiting for something bad that may or may not ever happen again.