....so now we have some new facts. You were in front of your students, leading them around the quarry, and one was apparently so far behind he was out of visual range.
Instead of you watching your students and having them in your sight AT ALL TIMES, you are playing follow the leader, with your students having the burden of keeping up with and following YOU?!? How can you possibly say you had any control over your students at all, if they are behind you and you can't see them??
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The post of our Instructor does not say he (the Instructor) lost site of the student... it says the student lost site of him. There is a big difference.
As a qualified and experienced Instructor I am able to both lead my students and keep an eye on them - simply by swimming on my side and looking back... of even by swimming backwards...
While I agree I prefer students lead and I follow... there are times when visibility dictates the Instructor should lead and use the alternative swimming methods posted above