Note: I am on my mobile so I can't link it just yet. In the recently released HD version of the demo that Bungie uploaded, I think we see an assassination begin but it is cut off. Right after the Hunter, Darla I believe, says "Going left." She does what looks like the beginning of an assassination animation but Staten continues forward, cutting off our view. Another minor thing I noticed is that in the icon image for the video we see the weapon on the Warlock's back. Lastly, we know have seen Ghost open up to create light as well as the Glimmer disappearing at the same moment that Staten picks up the loot, leading me to believe that you get all the Glimmer for the Slayer when you pick up the loot as well as with any other mini-boss.