Problem with archmage

[Fatt_Shade]

I just now figured this miss in special_attacks.lua
Got lucky and found 2 archmage staff, so i got Agraves to try it out and in battle my archmage`s have dmg 7-14, but when i use battle trance they get only 5-8 bonus dmg, their base dmg, not current that is upgraded by 2 weapons. So in special-attacks i found this strings :
Attack.act_apply_dmgmin_spell( "magic", 0, power, 0, duration, false)
Attack.act_apply_dmgmax_spell( "magic", 0, power, 0, duration, false)
where i`m guessing power is their dmg defined in archmage.atom file.
How to add bonus dmg from staff in battle trance ?