Sign language is not universal. Just as every country has its own spoken language, every country has its own signed language that is tied to the culture and beliefs of the region.
ASL is not based upon simple gestures. Signed languages include complex visual grammar using facial expression, the space around the signer, and other linguistic markers to indicate temporal and spatial relationships.
ASL has a unique grammar and syntax, and is not a signed version of English. As no two languages translate word-for-word, the projected titles follow the written English script of Man's character while he signs in ASL.
In storytelling, ASL users may take on the subject position of multiple different agents in the story, effectively becoming characters in the story.