if i understood it correctly, you flip the lag switch while stealthed. then you can unstealth and cap the door and the server still shows you being stealthed. In essence, you cap the door while in stealth.
I could be wrong, but i had my camera on the door the whole time, and there was nobody there. as soon as the bomb was capped he appeared for an instant then stealthed again...
Again this was on the first server i was on. and it was a long time ago.
this would obviously only work if u were host.. which ur not so..