Stuck at the Paul mission (Bug?)

So I decided that I wanted to start all over again without using any cheats but there is a problem at the mission where you have to fight Paul. I got through the first part of the mission without any problems, but then when Pierce lands the helicopter on the roof to take you to the next part of the mission nothing happens when I get in, the helicopter does not take off it just sits there on the roof and I get stuck inside it.

My understanding of what may be happening:
Being a game developer myself, and having played a lot of games, I have a good understanding of how the technical side of games work, objects, code, backface culling etc, and this is my interpretation of what is causing the game to get stuck. When the player enters the helicopter, that should be a trigger for the game to run the next lines of code, but for some reason the game appears to be missing that trigger, and because it can't run the code it just gets stuck at that point.

Is there anybody who has experienced the same issue?
Does anybody know how to fix the issue?
If you could be so kind as to let me know I would really appreciate it.

Thank you for reading.​
 
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