function damage takes nothing returns nothing
local group g=CreateGroup()
local unit e
call GroupEnumUnitsInRect(g,bj_mapInitialPlayableArea,null)
    loop   
      set e=FirstOfGroup(g)   
      exitwhen e==null   
     call TriggerRegisterUnitEvent(gg_trg_BackStab,e,EVENT_UNIT_DAMAGED)
      call GroupRemoveUnit(g,e)
      endloop   
    call DestroyGroup(g)
set g=null
endfunction
function Actions takes nothing returns nothing
local unit t=GetTriggerUnit()
local unit c=GetEventDamageSource()
local real a=57.296*Atan2(GetWidgetY(t)-GetWidgetY(c),GetWidgetX(t)-GetWidgetX(c))-GetUnitFacing(c)
if a>= -150. and GetUnitAbilityLevel(c,'A000')>0. then
call UnitDamageTarget(c,t,GetHeroAgi(c,true)*.25*GetUnitAbilityLevel(c,'A000'),true,false,ATTACK_TYPE_NORMAL,DAMAGE_TYPE_NORMAL,WEAPON_TYPE_WHOKN  OWS)
call DestroyEffect(AddSpecialEffectTarget("Abilities\\Spells\\Other\\Stampede\\StampedeMissileDeath.mdl",t,"chest"))
endif
set c=null
set t=null
endfunction
//===========================================================================
function InitTrig_BackStab takes nothing returns nothing      
set gg_trg_BackStab=CreateTrigger()
         call TriggerAddAction(gg_trg_BackStab,function Actions)
         call TimerStart(CreateTimer(),.1,false,function damage)
endfunction