activate_struggle_catalyst_secondary_character_involvement_interloper_or_uninvolved_trigger

activate_struggle_catalyst_secondary_character_involvement_interloper_or_uninvolved_trigger = {
	phase_has_catalyst = $CATALYST$
	save_temporary_scope_as = struggle_temp
	$CHAR$ = {
		OR = {
			any_character_struggle = {
				involvement = interloper
				this = scope:struggle_temp
			}
			NOT = {
				any_character_struggle = { this = scope:struggle_temp }
			}
		}
	}
}

As written in game/common/scripted_triggers/00_generic_struggle_scripted_triggers.txt.