Board Thread:Metal Gear Solid V/@comment-2224625-20140911210224/@comment-2224625-20140912030220

Huh? You mean from the E3 2014 trailer?

That was a Diamond Dogs member playing around with the laser sight on his pistol. Also if it was intentional, keep in mind at the end of the trailer we see Big Boss on friendlier terms with Skull Face it seems and he shoots a few Diamond Dogs at the very end. I have another feeling some part of the story is him leaving the Diamond Dogs for whatever reason