AfterDark
Contributor
Make them plan the dive. Go over all signals and contingencies and tell them if they deviate from it they are on their own. If there is something in their plan you don't like, say so. Every diver should be able to plan the dive they are going on including dives they are a student on. That's part of the learning process.
If they can't they should not be doing that dive and perhaps you should not be trusting them to do it with you. Let them know up front and in very clear terms that if they do not stick to the plan you agreed upon they are not to expect you to follow them.
There are too many with a sheep mentality that expect others to do everything for them and just follow along. What they do not realize is how dangerous this is for them to do. At least until the SHTF and then they see how leaving their safety to others might be the last thing they ever do.
This was how I learned and became proficient after only a few years of diving. There was a dive club with members that were very experienced sport divers, some had military diving backgrounds others were retired commercial divers (hard hat) and knew how to get a young kid's attention. I planned every dive we did. Every diver had their input. They would purposely throw curve balls into some of criteria of the dives to see if I'd catch it or to verbally poke me when I didn't....for weeks. Those guys were hard but they knew how to teach lessons that stayed with you! Those were among the best diving experiences of my life.