I am stuck in rennes pawn shop with the bomb how do i get out alive i am realy realy stuck please

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RENNES' PAWNSHOP: Go into the back room to find Daniel Rennes. A strange symbol is scrawled in blood on the floor near his body. Pick up Rennes' wallet and examine it (go to Inventory, then Items, select the wallet and use it) to see a scrap of paper with a code: 14529. Use this code to open the door with the keypad at the back of the room. Inside is load of stuff intended for Von Croy: a map of the archaeological dig, a map of the sewers around the Louvre, two guns—the DART SS and K2 IMPACTOR—and ammo for both, plus some explosives. The last pick-up will trigger sensors that arm the bomb in the next room, so take care how you collect the items.

I recommend making the explosives the last pick-up. Before you take them, position Lara above them facing the button on the wall and save your game. Then if you flub the timed run, you can reload and try again. Pick up the explosives and quickly sidestep to the right twice before the cut scene starts. This shows the detonation countdown starting. When the cut scene finishes, you'll already be in position to press the button, which will save a little time.

TIMED RUN: Press the button to open the door. Run out and swerve to the right toward the trapdoor. As soon as you see the hand icon, press Action to open the trapdoor. Then jump forward into the hole, rather than safety dropping, which wastes time. (Alternately, press Forward + Roll at the edge of the opening to somersault into hallway below.) Take running jumps down the hall to cover more distance. Then jump into the hole at the end of the hall. Immediately run to the left along the pipe to escape the billowing flames. Or, to get away from the flames faster, jump forward and then start running. (When Lara drops into the pipe and you lose control of the camera, try not to think about what you're seeing and just press Forward and Left to start Lara running in the right direction.)