Fires when a unit's spell cast is interrupted
Signature:
("unitID", "spell", "rank", lineID, spellID)
Arguments:
unitID- The unit that's casting. (string)spell- The name of the spell that's being casted. (string)rank- The rank of the spell that's being casted. (string)lineID- Spell lineID counter. The Nth spell that UNIT_SPELLCAST events have fired for. Unique to each spell cast - UNIT_SPELLCAST_START and UNIT_SPELLCAST_SUCCESS events referring to the same cast will have the same lineID. Resets to 0 when the count reaches 255, but this number may just always be 0 for some spells. (number)spellID- The id of the spell that's being casted. (number, spellID)