Speedi, QF put out a burst recently to their crew articulating the methodology utilised in the aftermath of an incident such as this. The stand down is not a punitive action in the first instance but it does facilitate the investigation being completed in a timely manner and without the crew being subsequently distracted by having this hang over the heads.
Anyone recall what the weather was doing last Monday? Breezy IIRC? Rainy too? Wasn't that the day that we had a bunch of storms and such through Sydney? Anyone got a TAF for the day? If the weather was pretty ordinary I can see a particular chain of events that could lead to this.