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AI_EVENT_HOSTILE
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Character touching this brush will become a hostile enemy
to all other characters in LOS, that have the same "cast_group"
as the brush.

Example use: select 2 characters and open Entity inspector.

Key    cast_group
Value  153

Value is the number of their cast_group.

Key    localteam
Value  postbattery1

Value is the name of their localteam.

Key    targetname
Value  119

Value is the targetname of the character.

Select another 2 cast_ entities and open Entity inspector.

Key    cast_group
Value  152

Value is the number of their cast_group.

Key    localteam
Value  postbattery2

Value is the name of their localteam.

Key    targetname
Value  119

Value is the targetname of the character.

Create ai_event_hostile brush with x: 64 y: 64 z: 32 and place it on the
ground. Select it and open Entity inspector.

Key    cast_group
Value  152

Place it inside character with cast_group 153.
That means that this cacharacter and members of his localteam is enemy
of cast_group 152.

Create another ai_event_hostile brush with X: 64 y: 64 z: 32 and place it
on the ground. Select it and open Entity inspector.

Key    cast_group
Value  153

Place it inside character with cast_group 152.
That means that this character and members of his localteam is enemy
of cast_group 153.

Create trigger_once brush with x: 32 y: 288 z: 128 (or x: 128 y: 16 z: 128)

Key    target
Value  t119

Value is the target of character.

Place this brush away from characters.
When you trigger trigger_once, it'll spawn four guys from two gangs, which
will start blasting ecah other. Creating the illusion of gang war.