function Trig_Backslide_Conditions takes nothing returns boolean
return GetSpellAbilityId() == 'A03G'
endfunction

function Backtrack takes nothing returns nothing
local timer t = GetExpiredTimer()
local unit u = GetSpellAbilityUnit()
local real X = GetUnitX(u)
local real Y = GetUnitY(u)
local real Angle = Deg2Rad(GetUnitFacing(u))
local real TX = X-15*Cos(Angle) 
local real TY = Y-15*Sin(Angle)
call SetUnitX(u, TX)
call SetUnitY(u, TY)
set u = null
call DestroyTimer(t)
endfunction

function Trig_Backslide_Actions takes nothing returns nothing
local timer t = CreateTimer()
local integer i = 0
loop 
set i = i + 1
exitwhen i == 20
call TimerStart(t,0.05,false,function Backtrack)
endloop
endfunction

//===========================================================================
function InitTrig_Backslide takes nothing returns nothing
    set gg_trg_Backslide = CreateTrigger(  )
    call TriggerRegisterAnyUnitEventBJ( gg_trg_Backslide, EVENT_PLAYER_UNIT_SPELL_EFFECT )
    call TriggerAddCondition( gg_trg_Backslide, Condition( function Trig_Backslide_Conditions ) )
    call TriggerAddAction( gg_trg_Backslide, function Trig_Backslide_Actions )
endfunction

local timer t = CreateTimer()
local integer i = 0
loop 
set i = i + 1
exitwhen i == 20
call TimerStart(t,0.05,false,function Backtrack)
endloop