I actually
saw a "true" multiple foul...years ago.
A1 was setting up to shoot, at the top of the key...B1 and B2 ran at A1, to defend the shot. B1 and B2, both, ran into A1 at the same time.
I
saw it...I blew my whistle...I thought ("I know this deal...I can come out with a "multiple foul" and show my rules knowledge")...in the end...
...I picked one. I just couldn't do it, for some reason.