The point is not just that he's blinded by the flag: He's boldly marching into the void, confident. "wrapped in the flag" is a great saying.
into the void, or off the edge?
"off the edge" is a clear interpretation of the statue. "into the void" is a bit more of a stretch. IMHO.
But that's art for you. Everyone has their own take on it.
Since that's all the info it gives us, it is acceptable to believe what we are shown is what we are "supposed to" see.
When Whistler paints one half of his mother's profile, I just naturally assume she has the other half of her body, too.