Ethan needs to leave the Vatican with everyone thinking he is Davian. Ethan as Davian leaves with Zhen in the Lamborghini Gallardo. In the meantime, Declan lowers the real Davian into a sewer. Zhen stops the car over a sewer manhole and the team descends from the car into the sewer. Finally, Zhen blows up the Lamborghini Gallardo.
One thing can be said for spy movies: they like to destroy beautiful cars.