Focusing on the portion I underlined, allies are not restricted from moving in regions. I propose the erratum:Here, There, or Yonder wrote:Tap a character during his site phase at a tapped or untapped Ruins & Lairs [ ]. Make a roll (or draw a #) modified by +3 if character is a diplomat. An ally may be played and placed under the character’s control if the result is greater than 6 plus the allyʹs mind stat and the ally is not restricted from moving in this siteʹs region. If an ally is played, tap the site if it is not already tapped.
"and the ally would not be discarded if in a company that moves to this site."
[edit: moved -> moves]