If that's the case, then I'm gonna need some rules for damage/knock-back when you get crushed/pushed by one of these babies, because to me, the #1 coolest thing to do with this is
shoot them at people. I'd want to rig up a 20 ft. chain, fix a barrier to it, and then swing at in a circle to shunt people around. Hell, you could literally make a
giant flyswatter and swing it through buildings to splat the people inside! It'd probably be some sort of modified bullrush, using a function of the weight of the spatial reference to which the barrier is linked, but leverage might also be a factor. You probably know more about physics than I do.
Or perhaps there's already something in the established rules you could use to calculate it?