if (global.turntimer < 600)
{
    rsize = random(70);
    rr = floor(random(2));
    if (rr == 0)
    {
        bb = instance_create(global.idealborder[1] + 20, global.idealborder[3] - (40 + rsize), blt_sizebone);
        bb.hspeed = -3 - random(3);
        bb.blue = 1;
        bb.dmg = 1;
    }
    if (rr == 1)
    {
        bb = instance_create(global.idealborder[1] + 20, global.idealborder[2] + (40 + rsize), blt_topbone);
        bb.hspeed = -3 - random(3);
        bb.blue = 1;
        bb.dmg = 1;
    }
    alarm[0] = 5 + random(20);
}
else
{
    alarm[1] = 20;
}
global.turntimer += 37;