My friend and I tried a mock fight and something very strange rule wise happened. My character is equipped with boots of levitation and grappled his character. We floated up for two turns. He spent his turns casting investiture of stone and dispel (on boots effect).
When we fell he stated that he would fall through the ground and take no damage but I stated that he has to use his own movement to use investiture of stone's effect and since he was grappled he could not. How would this situation work?