It's hard not to give this simple tutorial a 5.0. Why? Because it's exactly what it claims to be. It's a very brief tutorial on one little but useful thing for creating scenarios in AoK.
It's nicely done, well explained, short, and to the point.
I liked it. It's not a game, it just explains how you can set up a pair of triggers on a unit so you lose control of it if it goes out of sight of some other unit of yours (presumably a leader unit of some kind). It's a tutorial, just like it says.
Okay, that's all. If you need to know about this (and most of you budding scenario designers desparately need to know things like this!) then have a look.