Contemplating upon the ravens, Bartholomeus can say that these ravens did seem to be epitomes of their species. However, that can be true of Faeries or Magical creatures. It is also true that ravens are often familiars to magi, but sadly, without a more direct examination, he can't confirm if these were faerie or magical creatures, but he can be sure that they were supernatural creatures, at the least.
With that, the magi have pretty much gleaned all of what they can from what has transpired with the ravens. I need to know if the magi setup the Aegis immediate after the ravens have flown off or if they take some time. I need to know the parameters of the Aegis, and a description of the bounded area. It makes no difference to me if the boundary is already in place, or if the troupe wants to spend some period of time to create the Aegis boundary, it merely informs me of how I need to shape the next bit of the story.