No...when the bar is full, it disappears...but it is then that you can actually turn the gun on it's team. The effect lasts a certain SHORT time, afterwhich the Sentry explodes. If there are no team mates of the SG in range, it won't shoot at anyone. Players on YOUR team(the spy who tampered with it) can run past it freely once the Sabotage has been issued by you.
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