| You speak words that have mangled meaning. I can't tell whether you're
| speaking truth or garbage until you define terms.
| Define motion in spacetime.

There is no motion in spacetime. A spinning bullet is a fixed helix in 
spacetime.

| Define simultaneity in spacetime.

Simultaneous means "at the same time", but in spacetime
it means "at the same place" for a clock.
Example:
The marked ends of a ruler are simultaneously 0 and 12 (or 0 and 30 in cm)
in space, distance 12 inches.
A clock is simultaneously 12:00 am and 12:00 pm in spacetime, distance 12 
hours.