CleverRaven/Cataclysm-DDA — pull request #9890 by kevingranade (2014-11-08 03:17:41+00:00)
Title: Overhaul obstacle pile on

Zombies will now bash doors again, but if they're alone they won't make any progress. If they have other nearby zombies though, they'll pile on and their cumulative bonuses will allow them to take the door down.

The old pile on only worked if they approached the door from a cardinal direction, the new code works from any angle.