Is like this:
If Manglers touch a unit, that unit gets 2d6 hits, if there are characters then we need to see if they get a chance to be hit, and this only happens once all troops have gotten a hit. lets say a unit of 5 rank and file knights, a champion, a lord and a wizard, the mangler moves and touch the unit and does 7 hits, so 5 are alocated in the rank and file troops, and the other 2 are ramdomized betwen the champion, the lord and the wizard, to a maximun of 1 hit to each, if the mangled had roll 9 hits, then 1 hit to each model and an extra hit to a rank and file, if there were only 4 knights a champ a lord and a wizard and the unit gets 8 hits then 1 hit each model and randomize the extra hits.
If the manglers hits a 1 or more units in close combat then the mangler does 2d6 to each unit it touches in its path.
I think this is how this works.