It is a vision of the Reapers destroying everything organic in the Protean planets, but take a look at this video:
At 0:06, you can see something like a mouth opening and an animal scream. That can be a Protean being ripped apart and screaming in agony, but it seems more like an Organic creature attacking. I really think that there are entire races working for the goals of the Reapers, some of them hoping to be spared against the whole galactic xenocide of the Reapers or some other undisclosed goal.
Of course there are other races that have been indoctrinated by the Reapers. If you talk to Vigil on Ilos, he explains the pattern of the Reapers, and how they usually destroy organic life from start to end:
Use the Keepers to activate the Citadel Mass Relay to usher in the Reaper fleets
Reapers destroy all opposition in the Serpent Nebula, and gain access to census data, intelligence, files, and other critical info concerning sentient races.
Cut off communication/relays among all systems, leaving them alone and fragmented
Systematically exterminate planets, one by one
Indoctrinate primary and secondary species that are anti-Reaper, and release them as refugees to remaining colonies
Harvest resources for hundreds of years
Return to dark space, leaving a single vanguard to prepare for the Reapers' return in 50,000 years
So it's likely that the Prothean vision contained other indoctrinated species. Although we always hear about the Protheans, and their demise, it's likely there were other, lesser-known sentient species that lived alongside the Protheans, that were in the video, attacking the Protheans.
It'll be interesting to see if there really is just ONE Vanguard in the galaxy.
Though you'd thing if the Reapers left a second it would have assisted Sovereign.
starcraft - Playing Games = FUN, Talking about Games = SERIOUS
