In order to capture the last point, BLU must first capture the point that unlocks the doors to the point, if the final point isn't capped in time, RED wins. Easy, right?
There's a catch, RED can lock it back up by capping the point again, so enjoy simultaneously playing defense and offense for BOTH TEAMS!

This is fairly different, I haven't ever made anything like this before nor have I seen any maps that ever thought of this concept. If there are, send me them!