deSitter:
One thing to consider here - the pilots may have seen the RJ and had no worries, as there is no way to judge where one's airplane is at that scale, one would not rely on eyeballing, particularly at night, when sitting at the wheel of a rolling auditorium - one would have a reasonable expectation that the ground crew had done their jobs properly and that "the RJ I see there to my left, is out of my superjumbo's path..."
I'm amazed that the A380 doesn't have cameras for just this purpose. Lacking that, if there is an iota of doubt, the safe course of action is to stop the aircraft and request confirmation of clearance.