Wolfdrop, I just read the scene and it has to be a compulsion. Or, its what it seems to be. But, it is the same meeting as the Shrial Knights. Maybe it wasn't a Compulsion, which we know is a way to gain info (which Akka said he was against vehemently, and I truly don't think he would use it.). I think it might have been a calling of some kind, you know, to get Inrau where he could talk to him in private and let him know why he was in Summa. To me, I don't think it was a Can't of Compulsion. But, I do believe it was a way the Akka uses to lure someone where he wants them. We know what the Compulsions do, look no further then Xinemus. I don't think for one second it was a Compulsion. But, I do believe sorcery was at work.
Here's what I think, I think it was a Can't of Calling. And what Inrau's inner dialogue is, is of Akka sending to him. And, this makes sense and also adds up. Moe sent dreams to Ishual and no Mark was left, per Kellhus (another argument, but I believe and can offer proof that Kellhus got those dreams, just read the Leweth sections.). Hence no mark. And, Akka planted the info in Inrau dreams to meet him at the bar. Another thing that makes me know its not a compulsion is that their in Summa. Home of the Thousand Temples, a spy sorcerers worse nightmare. No, it was a calling to get Inrau to where he needed him, without risking the Temple, Shrial Knights and the College of Luthemaye.
Still, great find.