the first video relised by boston dynamics back in the days was together with a second video (not promoted) available on their medis section on their site with the interview to the ceo...at the question what bigdog was designed his candid replie was: to hunt down humans.

this is like the video of the jevvs saying they received text messages to not go to work in the morning of 9/11 aired live on TV...a video who disappeared to not be seen again.