I finally started pressing the button with the come in whistle when my obstinate dog took to magically sitting precisely behind a hay bale or tree on a regular basis. It absolutely 100% was deliberate. Button pressing solved it.
That seems like risky advice to post on the internet.
Because this may to lead to "superstitious behavior" such as flaring hay bales, popping, no-goes, piggy running, etc. since the retriever is directly burned with come-in command. (Direct pressure)
Imagine a smart retriever that has been directly burned with a come-in whistle because he is behind a hay bale.
Next hunt test or field trial the blind is a tight keyhole blind between 2 hay bales.
Smart retriever flares the keyhole blind....
Use of an ecollar without preceding a command (direct pressure) is very risky unless
superstitious behavior is desired such as training a retriever to avoid snakes or porcupines.
A less risky approach is to use indirect pressure, always preceding any ecollar nick with a
known command such as sit-nick-sit.