Talk:Summon Assassin/@comment-74.12.173.47-20150624012404/@comment-16533050-20150624080651

In my own personal head-canon its something of a ritual. Certain Assassins are selected before a mission and - in a procedure similar to the way the Watch Guards talk about attuning themselves to a Wall of Light or Arc Pylon - these Assassins are 'attuned' to Daud's ability to summon them.

When so prepared, they are readily available to their Master, and will appear at his summoning.

I also think (again in my own head-canon) that there is a reverse to this procedure, another ritual if you will. It explains why the Assassins in the Prologue are able to disappear even if Corvo kills them, thus leaving no evidence. The bodies will Transverse to a prearranged location away from the main site to be transported away if the need should arise.