GetThreeRandomEnemies ~ efficent

--[[
    -- Usage:
    local targets = GetRandomEnemies(unit, 3)
    for k, target in ipairs(targets) do
        unit:CastSpellv(target, 11)
    end
]]

local function pick(n, t)
    if #t <= math.max(n, 0) then return t end
    local picked, remove, random = {}, table.remove, math.random
    for i = 1, n do
        picked[i] = remove(t, random(#t))
    end
    return picked
end

function GetRandomEnemies(unit, n)
    return pick(n, unit:GetInRangeEnemies())
end