There has been some discussion earlier in this Thread about the various Landing Pads, Routes, and some general conjecture about RT procedures and the like.
I am unsure of whether someone in the know about the SOP' or agreed upon procedures in place that day have provided us with a good explanation of all of that.
The questions you ask have been discussed along the way by several posters.....but a well placed source has not done so to my knowledge although I may have missed it.
Logic tells us there are such procedures and have worked well in the past as this is reputed to be a very professional operation with high standards of safety.
All of which makes this tragedy such a shock to so many.