I bet Alice wishes her natural defence was as BS as infinity was. Alice's body emits a repulsive force which mitigates, and if strong enough, nullifies the kinetic force of things trying to hit her. Meanwhile Gojo forces anything approaching him to cross half the distance needed to hit him repeatedly and infinitely. Things don't slow down as they approach him, they just cross infinitesimally small halves but never make contact because you can't divide your way to zero. The things an actualised paradox.