Fortitude

In a flashback to a night in the late 1940s with a "blood" Aurora over a Russian camp described as 60 km north of Fortitude, a Russian man discovers another in a tent. There are sounds of bones crunching, and the man in the tent turns to reveal he is devouring a baby. The first man shoots him, only for the man to rise again and walk past him outside. The enraged first man pursues him, shoots him again, but the man again rises and disappears.