PC or nothing?

[bob jenkins]

Originally Posted by cdaref

Reference, please, for requirement that a person with LGP needs to fall over for there to be a disadvantage.

There isn't one. But, it's a given in the OP that there was no disadvantage. So, there can't be a personal foul.

If you want to cahnge the play to say "Large B1 has LGP and is run into by small A2 casuing (insert disadvantage here) but B1 doesn't fall down", then I agree with your call.