Fires when a unit's channeled spell is interrupted or delayed
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. This number is always 0 for channels. (number)spellID- The id of the spell that's being casted. (number, spellID)