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The second layer mask is a vector mask, but I can't help with that much. Here is a tut from adobe that might help you. I don't really understand the difference as I use vectors (pen tool) to create a pixel layer mask. The tut shows vector shapes to demonstrate and also image cuts.

I'm sure someone will come by who can explain this to both of us. Check it out in PS; if you add a second layer mask on a layer, it will be a vector mask. Maybe just that info will help you find your answer. I'm sure your students will appreciate it. So hang in there. We have lots of members who are very familiar with the many nooks and crannies of PS, and tech-savvy as well.