And it is worth noting that all the rest of the cav units in the game don't have an auto-break away. So that factor isn't part of being cav, it's just the MH special mount rules.
thatīs not the full truth....
Dragonriders can go into the CC with their Naginataīs up to one inch away from the enemy model.
Since they arent in B2B then when trying to leave the Target, they only leave....
Further we are talking here of all the troops leaving CC, inlcuding the ones that do it automatically as flyers and the ones that simply get lucky by rolling. You have to be able to reach B2B, thatīs important.
Just one thing. Does this work for the Fenris bike in the same way or is it no problem in anyway because it is a vehicle? As far as I know the Fenris is the only 100% Close Combat Vehicle.
The Fenris bike can attack after a 1" movement the target it just left (drive by attack) and because of this it can ignore the first target (still in CC caused by the drive by attack) and can attack the next target. Sounds correct in my opinion.
Not so easy.
Since the Fenris Bike is a vehicle you leave and be done with your last target.
Now you want to hit the last target again using the special rule of charging for FenrisBikes within one inch of the model (not that you lose the strenght of the vehicle for the charge if you donīt move at least.
3".
I would say that this doesnīt work, because you leave the target and thus the facing isnīt right. you canīt attack an enemy in your rear facing, remember vehiclas arenīt allowed to make turns freely.
BUT, have a look here, bolding the important parts:
The driver of a Fenris
may move and attack an
enemy
within one inch of the bike with hls
sword using a single action. The attack my be
launched
at any time during the move. lf the 1
fenris moves a minimum of 3 inches before
the attack, the damage is determined by using
the vehicle's STR instead of the drivers, this is
the unit's primary attack. If the fenris has
adaquate movement remaining atter its attack
to reach basecontacl with another model, it
may attempt a secondary natural attack by
rarnmlng the new target. This is effectively a
charge, with a successful CC roll Indicating the
ram was elfective.
So if you phrase it otherwise it works

Just turn and hit, drive on and ram......
You would lose the strenght of the Bike anyway if wanting to hit the model you leave.