Yes, you did miss something; not sure if it is in the current tutorial, though. (It certainly is very, very hidden in the manual. With some justification in that some newbies "love" it and use it without any sense)
In fact, it is so hidden I cannot find it in 3 minutes right now o_O.
In short, you can pay 3 pillz (that DO NOT INCREASE ATTACK!) for +2 damage. By clicking on the button labeled "fury" on the right side of the pillz-to-use. (Hum, new pictures for the manual would be nice, too...). Just look for it and you will see it. It is good as a tactical option.
Do you know what fury is or is this a glitch you have noticed?
Well, if you don't know what fury is, basically it is the addition of two damage for three pillz. You should see the fury button when you got to add pillz to a character, all the way to the left.
Obviusly fury is a bit of a gamble as the 3 pillz are wasted if you do not win the match.
Hope this helped!