Games can turn on the tiniest incidents in football

A missed opportunity. It is an imprudent moment. It's fast thinking for a second. These are the inflexion points of retirement which can plague athletes or coaches for decades. The meaning is often clear at the time. Slip by Steven Gerrard. A failed offside trap as Ali Daei sets Khodad Azizi free. Yet, they're not more often than not.

A ball strikes Aaron Amadi-Holloway's arm inside the box in Round 12 of the A-League, 47....