With Velda constantly shrinking her size, the barrier around her shrank as well. This smaller barrier needed far less energy and concentration to stay active, so Grace was able to avoid the Treant's swing at her, but also bring Velda into the path of the hit. She made sure to keep the barrier around her active just long enough for there to be no chance for escape. Just before the Treant struck, the barrier ended and Velda felt the full force of the blow. Before Velda could recover or move at all, Grace threw up a another barrier around her keep her movements restricted.