Talk:The Sacrifice/@comment-24460960-20180104140730

Seeing as how Ballas uses the exact same "All miracles require sacrifices" line from the early War Within script leaks and in a very similar context, I think it's safe to say he's talking to the person who becomes the first Excalibur Umbra. Possibly even the first warframe.

The War Within leak apparantly had Ballas asking a mystery Dax in a flashback sequence labelled "dumbraflashback" about how far they would go to save them (The Operators). This trailer seems to use the exact same context. Someone is clearly injured and Ballas is openly asking someone if they would trade their life so the injured party can live.

So hopefully we'll be finding out exactly who and what the Warframes actually are in the quest.