Strax our border collie (8 months) is taken to bicycle free off leashes a couple of times a day, the third time we walk him leashed in a off leash unfenced park to help him to be less reactive to bicycles, he is fine when they are close, but his collie eye catches anything over 30 meters away & takes chase, thankfully I have a loud voice & yell asking the biker to slow or stop. Strax's recall is perfect & will drop/stop even in chase, We noticed the take chase mode a couple of weeks ago & have leashed him in this park since & he is understands the leave it command anytime excepts he sees bikes at a distance. Is there anything I'm missing doing in this situation?
To be clear he has shown no interest in scooters, skateboarders, runners only Bikes.