(1) Where an event is caused by acts of several persons acting either jointly or independently, each of those persons who has intentionally, recklessly or negligently contributed to cause the event shall, subject to the provisions of Part 4 of this Chapter, be deemed to have caused the event.
(2) Any excuse or justification applicable in respect of any one of those persons shall be applicable to any person regardless of whether such excuse or justification is applicable in respect of any of the other persons.