Don't worry about Grayson. The alphas in this universe are practically superhuman, possessing immense physical resilience and healing abilities—even drugs barely affect them (and Grayson is even more resilient than other alphas)—so that cliff is nothing to him.
that baby is hella strong he managed to get to the other room and climbed a bed
what do you expect, he is ghuya's son so he must be strong