In Fall of Hyperion, when the Shrike comes for Martin, it takes control of his hand, forcing Martin to write out messages from the Shrike (e.g. "It is time.").
How did the Shrike do this? I don't recall any other mention of the Shrike controlling a person's body, nor does it seem like there would ever be a need to, considering its apparent mastery over time and space.
Even Martin was surprised that he was the first and only person that the Shrike was known to have communicated with.
It seemed like the Shrike had the ability to take direct control of a person's fine motor skills, yet that also seems like the only time it has ever used that ability. It certainly didn't seem to do anything like that during its hand-to-hand combat with Kassad, even though it was being hard pressed, and an edge like that would almost certainly have made a significant difference?
I've only read through Fall of Hyperion so far... is this particular ability of the Shrike's explained later? Or are there explanations in the first two books that I may have missed?