I managed to guide Amber and Kyle into the Crimson Fields last night, and with my help they completed the instance!
I hadn't noticed those banners before. Cool! When you click them, they slide up and announce your presence. During the stage where you fight random trash out in the open field (defeat 13 on the battlefield), a boss mob will show up if you have those banners flying. At least that appeared to be what happened. /shrug. Did everybody know that? I felt like such a noob for not noticing those before.
Looks like it's onward to the Cave of Solitude now! Go kids!