So If I have a waveserpent with a unit of Wraithguard.

1st turn:
Move flatout, 18"s.

2nd turn:
Move 6"s.
Swivel around so rear/side is facing enemy. { I know yikes! }
Disembark Wraithguard unit.
Wraithguard move 6"s from rear of waveserpent.
Waveserpent can swivel turret and fire turret weapons on enemy.
Wraithguard unit can fire on enemy.

Then can run Wraithguard unit forward D6"s, if I wish.
But no Assaulting.

Have I got that right?