Blue Coat AV prevents viruses, trojans, worms, and spyware from entering your organization via the Web. Gateway anti-virus scanning secures rogue channels such as personal Web email and Web downloads.
This means that if the Bluecoat AV malfunctions, it can expose your mission-critical environment to malicious virus attacks that can cause significant data loss. To prevent this, the Bluecoat AV has to be monitored at all times. This what eg Enterprise exactly does.