That's funny, The BA's, according to the newsletters, were stationed on Kasr Partox to deal, not Macharia...

"The Blood Angels, after their arrival on Kasr Partox, are preparing for the assault of the largest horde of World Eaters seen in living memory."

That's from the seventh week newsletter, other than that, there has been no other mention of the BA's moving from KP to Macharia to have the 3rd Obliterated.

I hardly believe this information, unless I see it typed from a GW Employee's fingers.
Brother Captain Cameron Davion, Leader of the Sword of Sanguinius