>
>either something else is up
> Hm! I now have a supposition.
If Sakuya doesn't meet Gryphon at this point, his personal future doesn't happen correctly, which results in the Doctor's personal past being altered.
This isn't about not setting something on fire; it's about a paradox that would wreck two dimensions, and probably suck a few more into the chaos.
Peter Eng
--
(Also, there's a non-zero probability that if Sakuya doesn't show up when she did, Gryphon gets killed to death in a storm of energy spheres.)