The terrorists are close. You can hear them through the door, whispering. But there are only two of them, so, feeling action-star confident, you race into the room with your assault rifle blazing. One second and a flurry of lead later, you're dead.
Quickly recognizing that you're not the indestructible leading man of most videogames, you turn to your two teammates. They must be standing here for a reason... and two-versus-two sounds like a fairer fight. Ordering them through the very same entrance, you hang back and wait for the "all clear." It never comes. The terrorists found cover and your men, completely exposed in the exchange, are now crumpled on the floor and fading fast. You dash to their aid, receiving another fatal head wound as your reward.
The third time is different. You study your options, as well as the layout of the building. Noticing that the room in question is top level, with a wall of windows to one side, you sneak to the roof and silently command your squad to rappel down the side of the building. Leaving them, you return to the death door and, rather than open it, snake an imperceptible camera wire underneath it. With the ambush set, you give the signal and watch in grainy black and white as two shadows materialize behind the glass, then explode through it. The terrorists dive for cover and turn to face the new threat, not realizing that the real threat- you- is about to bust that damn door to the ground and shoot them in the back.
Finally, success. Because now you're playing by Vegasrules.