Event:UNIT HEALTH

Fired whenever a units health is affected.
This event may be sent more than once to represent the same change if the affected entity can be accessed through multiple UnitIDs. For example, two UNIT_HEALTH events will be sent for raid party members who are also in your party group.
UNIT_HEALTH events are sent for raid and party members regardless of their distance from the character of the host. This makes UNIT_HEALTH extremely valuable to monitor party and raid members.
;arg1 
:the UnitId of the unit whose health is affected
;arg2 
:the new health of the unit