Here's a thing that, even though I've been playing for a long time, I don't think I've ever really understood...
It's easiest to talk about this with an example.
Let's say I have a speed of 4. In Phase 3, I run 9". Am I considered to have a velocity of 9" (even though my figure is stationary) until Phase 6? Or does my velocity just disappear at the end of the Phase?
If I am considered to be moving at 0" after my Phase 3, then where did my momentum go if I never decelerated? Also, do I have to accelerate again if I, say, want to do a Move Through against someone that pops up in an adjacent hex on my next Phase? (And in that case, I'd only be able to accelerate up to 5" and not do my full damage...)
On the other hand, if I am still "moving," does that make me vulnerable to a Martial Throw? (ie Someone can run across my path and hurl me to the ground with my velocity as nice damage bonus.)
Neither of these arguments really makes sense to me. (Or they both do.) Depends on the time of day.
In any case, it seems odd to me that if you've been running you can somehow lose your velocity between Phases... but in every game I've ever played, it's just assumed that in your next Phase you can do whatever you want without declaring that you were decelerating in your previous Phase.
In fact since acceleration/deceleration is a 0 Phase Action, I don't guess you'd be able decelerate after a Full Move, or Attack Action, because your turn would be over.
I must be missing something simple.
I must be.