scope A

    globals
    private timer array T
    private group array G
    private integer N = 0
    endglobals

function Trig_FireBoom_Timer takes nothing returns nothing
    local integer m = 1
    whilenot ( GetExpiredTimer() == T[m] ) { m++ }
   // дествие с группой G[m]
    call DestroyTimer(T[m])
    call DestroyGroup(G[m])
    if N != m {
        set T[m] = T[N]
        set G[m] = G[N]
        }
    set T[N] = null
    set G[N] = null
    N--
endfunction

function Trig_FireBoom_Actions takes nothing returns nothing
    N++
    set T[N] = CreateTimer ()
    set G[N] = CreateGroup ()
    // дальше пик юнитов и старт таймера
    call TimerStart ( T[N], 10.0, true, function Trig_FireBoom_Timer )
endfunction

//===========================================================================
function InitTrig_FireBoom takes nothing returns nothing
    set gg_trg_FireBoom = CreateTrigger(  )
    ....
    call TriggerAddAction( gg_trg_FireBoom, function Trig_FireBoom_Actions )
endfunction

endscope