Fired when a unit attempts to cast a spell regardless of the success of the cast.
UNIT_SPELLCAST_SENT: unit, target, castGUID, spellID
- string - e.g. for (Spell ID 1543)
- Fired when a unit tries to cast an instant, non-instant, or channeling spell even if out of range or out of line-of-sight (unless the unit is attempting to cast a non-instant spell while already casting or attempting to cast a spell that is on cooldown).