They fr just used a camera where you can see A main before the round starts
yes, but they can see the cam too. The illegal cams are the one that cannot be destroyed by the enemy, like for example the one in screens where u can see the glass but the enemy can't destroy the cam unless they run all the way into screens.
the cam didnt see anything before the barrier went down plus the cam was immediately broken when breach saw it
Do you know you can't see players before barrier drops even if he had cam that sees anywhere on the map
Try going into opposite side of barrier in custom using ghost mode if you have friends that is
Edit: you can't see enemy whatsoever