What the Stranger Knows.

[Auranghzeb]

Tedras knows enough to realize that it will be difficult to outsmart this Math Wizard, but the enigma formulation can help the party making some decisions, and tries as hard as possible to continue the formulation:

The train is traveling of course across all 4 dimensions, from point a to c. However, it is unknown if the travel across dimensions happens linearly.
The point about the passenger being observed is a clever one, wouldn't have thought it myself, professor, truly a mind as bright as yours could tell us if in interdimensional travel there are blind spots that prevent constant observation. That would help us with the second variable and would be crucial to understand whether substitution is even possible

Tedra's mind was racing, pearls of transpiration appeared from the effort. This was to much for a simple uneducated mind, but the others didn't jump to help!

Come on!

Tedras thought

you guys are smarter!