It is extremely unlikely that anything bad would happen to you if you couched everything in the terms of "Hey, we're all going to go to the pool to practice our skills," even if something did go wrong. I don't think you should instead say, "Come with me to the pool and I will see to it that your skills are properly refreshed." I personally would probably do it if it were I (and I am no longer an active instructor).
But you can never be too sure. A few years ago I was conducting a weekend of technical diving training at a challenging dive site, and on the third day, I got sick and could not dive. The students wanted to do a dive on their own. I made them sign a statement saying they were doing an experience dive that was not part of the class, they would dive within the limits of their current certification, and I had no responsibility for them during the dive.
My thoughts go to an incident a few years ago in which one of the world's most famous divers/dive photographers died during a dive, and an investigation found that he himself was to blame in several ways. Possibly because he did not have life insurance, his wife sued everyone who was even the most distantly related to event. She lost, but it took years and lots of attorney work.
But you can never be too sure. A few years ago I was conducting a weekend of technical diving training at a challenging dive site, and on the third day, I got sick and could not dive. The students wanted to do a dive on their own. I made them sign a statement saying they were doing an experience dive that was not part of the class, they would dive within the limits of their current certification, and I had no responsibility for them during the dive.
My thoughts go to an incident a few years ago in which one of the world's most famous divers/dive photographers died during a dive, and an investigation found that he himself was to blame in several ways. Possibly because he did not have life insurance, his wife sued everyone who was even the most distantly related to event. She lost, but it took years and lots of attorney work.