That's one thing to agree about: The question sucks!
The reason that I posted the commentary below was not to be a smartass but to illustrate the ambiguities that can quickly arise in this kind of scenario that makes the refs decision difficult.
The referee is responding to his assessor who has questioned why he awarded the scrum to a particular side and is writing his report.
Well, Mr. Reportwriter Sir, the ball was caught by Red from a Blue kick in open play (was that kick from a PK open play or a restart?) , the catcher took two steps (was that immediate or not?) before Blue wrapped him up and drove him backwards (Blue definitely going forward) as Red support joined (now we have a maul). At some point the ball was stripped from Red (did that happen before or after the maul formed?) but Red was driving forward (are Red now the side going forward?) when the whole mess collapsed (was that intentional?) . Blue placed the ball on the ground (does that make it a successful end to the maul?) and it was immediately available to the Blue SH.
I called "Use it!" but he was too busy picking his nose so after 5 secs I said (to myself) "**** this, if you don't want it you don't get it" and awarded a scrum to Red.
Now this last part would never happen (well, about as frequently than a zombie apocalypse) but it's the only non-ambiguous part of the whole event so that's what I'd call.