The floating dusty material when you see the Ghost Engineers running.

I just realised it reminded me of the way the Engineer at the beginning disolves into the air and begins to turn into dusty 'pollen'. First I thought that what you saw in the holograms were what was still in the air when they lit up, but now I'm thinking it possibly was what was recorded at the time of the outbreak. The film shows Shaw watching the recording and 'wonders if there was an outbreak' showing a clip of the dust and the door closing. Could the floaty stuff in the hologram be the result of an Engineer taking the cadbury crunchie bar juice you see at the beginning of the film? Or was it just a cool 3D effect?