Paralyze always targets commanders first?

[Foodstamp]

In a game I am currently in, a player had his mages scripted to spam paralyze.

During the fight, the casters spammed paralyze on my commanders but never my normal troops.

All units were size 3 including the commanders. Does the spell give priority to commanders? There were too many units on the field to attribute it to luck. The spell was cast over a dozen times and every time my commanders were targeted. Could it have possibly been due to hit points?

Thanks!