Number 1 rule when playing Dead Space: unless the corpse drops an item when shot or stomped, it ain't really dead.

Plus I think a lot of people really wanted to see a fourth game that took the series back to the more horror focus of the original and second games, a lot of fans are still annoyed at how EA treated Visceral, and their outrageous statements that Dead Space 3 had to sell nearly Call of Duty numbers for them to even consider keeping the series around.