Metro: Last Light trailer continues E3 2011 demo

The third video featuring the Metro: Last Light E3 2011 demo has been released, featuring hundreds of dollars worth of ammo being used to clear a path for the game's hero to board a moving train and find a prisoner. Doesn't he remember ammo is currency?

In Metro: Last Light from developer 4A Games, the protagonist Artyom returns and--from what we've seen in the previous two parts of the E3 2011 demo--has become as fiscally responsible as a modern-day mortgage association.

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Metro: Last Light launches in 2012 for the PC, Xbox 360, PS3, and Wii U.