Big exploit on Crossing allowing spawkilling

I've just been in a game on Crossing were the two players of security forces would constantly go far behind the terrorist spawn and lie down with MGs, that spot is aparently not out of their combat zone and they would just wipe out our team right as we spawned with almost no chance to ripost as our guns weren't even ready to fire before we'd die.

I tried to film it but my shadowplay fucked up.

Here is pictures of the spot in question

1_1549317906616_20190204205341_1.jpg 0_1549317906615_20190204205336_1.jpg