Legacy:KillingField
From Unreal Wiki, The Unreal Engine Documentation Site
This zone does nothing. It is used by the following AI functions in the Assault game type class to affect the behaviour of the bots.
- function bool FindSpecialAttractionFor(Bot aBot)
- function bool NeverStakeOut(bot Other)
As far as I can tell from an exceptionally cursory examination of the function it ensures the bots don't stand around and admire the scenery.
For examples of it's use see AS-Mazon and AS-Overlord.