OOC:
Alright so I think I have it. Kimberly will roll 2d (2d6 from my point of view but trying to use GURPS notation) and whatever that comes out to, will be compared to your ST-2. However many times you can fit your ST-2 into my roll is how many yards you are moved. For instance, if your ST is 10, then 10-2=8 and if I roll a 12, you would get knocked back one yard because 8 goes into 12 one time. So that's part 1 your ST-2 inside my 2d roll. Alright now...
IF you are knocked back 1 yard or more then you must do the following.....
Roll 3d against your DX, (or acrobatics or Judo if you have them) at -1 for every yard you were knocked back. So, if you were knocked back like above, and then your DX is 11, you roll against a target of 11-1=10, if you fail that you fall over!
Alright let's see how this goes!! Remember it boils down to if my 2d roll is higher than your ST-2, then you get knocked back at least one yard, I doubt i'll be high enough to make either of you move more than that. THEN IFyou get knocked back, you roll 3d6 against your own DX-1, if you fail that, you fall over. Alright here we go!!!