Board Thread:Off Topic/@comment-16473632-20150416092916/@comment-91.100.100.49-20160628192742

As you can read on the Thu'um wiki entry, you can learn shouts simply by training, but it is a lot harder for non-Dragonborns. Shor was also known as Lorkhan, and Lorkhan was born after Auri-El, who is also known as Akatosh. It is therefore safe to assume that shouts did not come from Shor. Tsun probably just trained to learn the Thu'um.