User blog comment:Jasca Ducato/*Spoilers* Juno, Eagle Vision and all that. *Spoilers*/@comment-1872981-20101124154528/@comment-1951351-20110605172739

Yes, but I'm pretty sure Al Mualim didn't know that Altaïr had Eagle Vision because he didn't even know at the time why Altaïr wasn't affected by the PoE, and therefore didn't know in what way Altaïr was special. So, I doubt that he could create an illusion for a sense that he knew nothing about (Eagle Vision).