Missed 5 hours of dev time by taking a nap. Oh well.

In anycase, implemented some pack-mentality to the AI, so if an Mob spots you, and others are chasing you already, they wont lose line of sight until you have lost -all of them-.

However if one drops off too far, then it will forget you, so eventually there will be too many.

Earlier on, the AI was simply losing line of sight, as other mobs were infront, blocking their view literally.