Official TGS trailers discussion.

[Otty]

While Snake runs into this museum he sees a raven on top of the statue, he probably remembers Vulcan Ravens words on Shadow Moses Island.

But my body will not remain in this place. My spirit and my flesh will become one with the ravens. In that way I will return to mother earth who bore me. Snake! My spirit will be watching you... understand?

[TheBrotherOfLight]

otacon said:

While Snake runs into this museum he sees a raven on top of the statue, he probably remembers Vulcan Ravens words on Shadow Moses Island.

But my body will not remain in this place. My spirit and my flesh will become one with the ravens. In that way I will return to mother earth who bore me. Snake! My spirit will be watching you... understand?

Yeah, I thought about those words aswell. Maybe that's why he smiles when the raven takes a dump on him. Remembering the fearful Vulcan Raven.

And the whole thing about Snake not using blades. I'm pretty sure he meant swords (I mean, swords was the context).