Half-Life: Sven Co-Op Crate Attack Trailer

This Video shows off monsters being able to shoot and destroy crates. You will see a few barney's destroying multiple normal crates, a few explosive crates and some barrels as well.
A lot of work has been done recently to calculate where an NPC should shoot at a breakable object. Arbitrarily shapped objects that level designers may create are no problem for the system. Having monsters be able to attack breakable objects will