I'm not a lore fanatic, I'm note even a lore n00b in that I know only a few hints of the Old Gods, the Titans, and some speculation here and there... but, for the life of me, I can't figure out why Garrosh Hellscream is orange. I watched a video a long time ago where Thrall and Gron (his father) were fighting against Mannaroth and he was green, how did he have an orange kid?
Any thoughts?
EDIT: Found the link to the video