Leonel didn't do anything immediately. There was simply no point. If he rushed to save these people, then what?
That would only be a temporary solution. By the time he got back to these people, they might be caught again, or even killed for the insolence of daring to escape in the first place.
He simply scanned through the iron collars just a single time before continuing forward. With that glance, he understood their properties and what they were designed to do, not to mention the fact he understood how to take them off without harming those that wore them.
He didn't try to hide himself at all. The presence of a human walking, and so very clearly at that without a collar, was shocking to many.
