Подскажите, как работает функция AddLightningLoc, почему если цель не видно, то создать молнию не получится?

function Start takes nothing returns nothing
    //local timer t=CreateTimer()
    //local integer id=GetHandleId(t)
    local unit u = gg_unit_hhes_0000
    local unit u2 = gg_unit_hcth_0001
    //local lightning l = AddLightningLoc( "CLPB", GetUnitLoc(u), GetUnitLoc(u))
    local lightning l
local location locU
local location locU2

local real x1
local real x2

local real y1
local real y2

local real z1 = 50

local real lx
local real ly

local real lz = 50
local location ul=GetUnitLoc(u)
call BJDebugMsg(GetUnitName(u))
//set l = AddLightningLoc( "CLPB", GetUnitLoc(u), GetUnitLoc(u))
set l = AddLightningEx("CLPB", true, GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul), GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul))
if l==null then
            call BJDebugMsg("l=null")
        else
            call BJDebugMsg("l=ok")
        endif
set l = AddLightningEx("CLSB", true, GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul), GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul))
if l==null then
            call BJDebugMsg("l=null")
        else
            call BJDebugMsg("l=ok")
        endif
        
set l = AddLightningEx("HWPB", true, GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul), GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul))
if l==null then
            call BJDebugMsg("l=null")
        else
            call BJDebugMsg("l=ok")
        endif
set l = AddLightningEx("CHIM", true, GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul), GetLocationX(ul), GetLocationY(ul), GetLocationZ(ul))
if l==null then
            call BJDebugMsg("l=null")
        else
            call BJDebugMsg("l=ok")
        endif

    call SetLightningColor(l, 1, 0, 0, 1)
    set locU =  GetUnitLoc(u)
    set x1 = GetLocationX(locU)
    set y1 = GetLocationY(locU)
    
    set locU2=  GetUnitLoc(u2)
    set x2 = GetLocationX(locU2)
    set y2 = GetLocationY(locU2)

    call MoveLightningEx(l, true, x1, y1, z1, x2, y2, lz)
    call BJDebugMsg("УСПЕШНО")
endfunction


//===========================================================================
function InitTrig_l takes nothing returns nothing
    set gg_trg_l = CreateTrigger(  )
    call TriggerRegisterTimerEventSingle( gg_trg_l, 3 )
    call TriggerAddAction( gg_trg_l, function Start )
endfunction