Adding Frighten_mounted to Sarissa units

[Cute Wolf]

Well, because that discussion in "Elephants going rampage" but then, the discussion shifts into about how effective spear can deter cavalry units, I gonna some experience on adding "frighten_mounted" on phalangitai units... as expected, some elite cavalry (kataphraktoi & hetairoi) can't push themself against the pikes anymore (they actually do it for some time and then routs)... but I got a little problems that is very funny...

When I add frighten_mounted ability to my humble Phalangitai Deuteroi, and build a normal battleline with them, any lesser light cavalry (such as thraikioi hippeis, and assortment of barbarian light cavalry, as well as hippakontistai), now are fled rather instantly each time I order them to charge the phalanx line.... FROM BEHIND....

Is there any sort how to made this unit is frightening only from the front?

type greek infantry taxeis phalangitai
dictionary hellenistic_infantry_taxeis_phalangitai ; Phalangitai Deuteroi
category infantry
class spearmen
voice_type Light_1
soldier hellenistic_infantry_pantodapoi_machimoi_taxeisphalangitai, 60, 0, 1.4
officer ebofficer_hellenic_officer
officer ebofficer_hellenic_standardbearer
mount_effect elephant -1
attributes sea_faring, hide_forest, can_sap, frighten_mounted
formation 1.1, 1, 2.2, 2, 6, square, phalanx
stat_health 1, 1
stat_pri 12, 0, no, 0, 0, melee, blade, piercing, spear, 0 ,0.17
stat_pri_attr long_pike, light_spear
stat_sec 7, 4, no, 0, 0, melee, simple, slashing, sword, 0 ,0.13
stat_sec_attr no
stat_pri_armour 8, 4, 5, leather
stat_sec_armour 0, 0, flesh
stat_heat 3
stat_ground 0, 0, -4, -2
stat_mental 9, normal, highly_trained
stat_charge_dist 30
stat_fire_delay 0
stat_food 60, 300
stat_cost 1, 1479, 370, 40, 50, 1479
ownership macedon, thrace