Who's query? The Collingwood players? The ump had no query, he paid the mark.The 15 metre query was one of a heap of things going on at once for the umpire.
Short kick, but paid, and then he went miles off his line with a view to playing on and neither play on nor stand was called.
Given the heat of all of that, the ump made a sensible call to bring it back (and I make this concession knowing that the AFL have said that it should have been called play on, which it obviously should have).
If it was too hot for the ump, and he was overwhelmed by the heap of things going on, he shouldn't be on an AFL oval.
As for what the AFL have said.....