Explaining dueling in the tutorial

Okay, I just ran through the tutorial, and I noticed that it doesn't explain how duels work. You guys might want to add this, as I am often pestered by low rank people who don't know what/how duels work. Anyone else with me?

It's explained when you challenge the person, how much Sp you will win/lose aswell.

It's also in the FAQ. Tutorial is supposed to be very basic, for those who play for the first time - I think we will only confuse them with duels.

Okay, that makes sense. Just thought I'd point it out.

Today i played with some newbies, by acident... they didn't found the tutorial and didn't knew about upgrades... they were three so its a common case i think...