Unforeseeable

A Culexus Assassin is sent to claim the head of the manipulative Farseer Lithandros-Esmanthil. The Eldar senses the threat and scries the skeins of fate accordingly, but is increasingly alarmed to find he is unable to locate the thread corresponding to his pursuer.
…Rendered psychically inert and driven to exhaustion by the chase, Lithandros-Esmanthis gives himself up to the sinister violence that follows.

"Dataslate: Officio Assassinorum"