The Most Fascinating Thing About This Language

This is a production of the summer Institute of linguistics, and they just want people to learn how to speak this language. They can translate vitals into it. So grammatically, to me, the most fascinating thing about this language is the things it makes its pronouns do. The real fun thing, and this starts on page 135 to explain it, is there's this concept in the language of a subject focus marker? Wait, am I on the right page? Where'd it go?