Half-Life: Sven Co-Op Crate Attack Trailer

This Video basically shows off monsters being able to shoot and destroy crates. In this Trailer, you will see a few barney's destroying multiple normal crates, a few explosive crates and some barrels as well.
Having monsters be able to attack breakable objects will mean level designers can have new gameplay options. For instance, imagine hordes of zombies trying to break down walls to get to the players. Or players may have to defend an important object f