In the original rules pg 74 it is clearly stated that armoured troops cannot evade or skirmish. I did not find it back in the updates but I am pretty sure that armoured horses may not evade or skirmish ( evolution of the rules ) .
What about protected horses with fully armoured horsemen ?
Compendium draft - "TuGs containing any charging lancers, battle wagons, elephants, devastating chargers, or any fully-armoured or armoured horse never run away or skirmish in any circumstances."
However, when ArmHrs was introduced last year all that was said was:
Quote
A new addition to armour types to distinguish troops with proper armour protecting horses. The Army List and Army Builder allow combinations of ArmHrs-‐Prot, -‐/FArm, ArmHrs-‐FArm to cover all types of Cv and Cm. ArmHrs slows movement to 4BW and gives protection vs. missile fire.
Nothing about not skirmishing or running away. So until the Compendium is released ...
-/FArm is still covered by the original rules at present and, therefore, cannot skirmish/run-away.