Attempted firing a rocket from inside of a building through a window towards an alien outside of building. Rocket impacted with window as if hitting a solid wall. Immediately after this the game crashed to desktop. I'm not sure if it is because too many things were trying to happen at once, but that would be my guess. The game was processing 3 windows shattering, the wall cracking, the explosion happening, and the character that fired the rocket being killed all at once.