A revision of the AR flag mechanics has been released:

Revised AR Flag Mechanic

Basically, in two instances, the AR will now hold the flag like this:

New AR Flag Mechanic

The AR will use this signal when:

  1. The referee has signaled a foul and makes obvious eye contact with the assistant referee for advice on whether the offense occurred inside the penalty area.
  2. During a penalty kick, the AR indicates that the goalkeeper has moved illegally and, as a result, a goal was not scored.