Trainers on the field directing play.

What is the Brisbane Broncos trainer doing on the field 20 mins into the second half. He is standing 3 mths behind the Bronco’s attacking play holding a water bottle yelling and pointing. This is rubbish. He should be barred from the field. Absolutely bending the rules. Didn’t go near a player to treat them. Trainers should barred from the field.
Are the officials and the bunked blind?