While Khalia, Taviss and Skarghash keep a vigil in the northern chamber over the glowing runes, Ari and Jango make their way around the tunnels to the southern room. As before, Ari steps in and puts his back to the far wall so he can see Jango through the small opening into the hallway. He then grips his sword, takes a deep breath, and pronounces the word "Kaethatyrric".
Another low-pitched hum is immediately heard, and both Ari and Jango recognize the familiar sound and their eyes go to the runes. Sure enough, the runes painted on the floor begin to glow green here too. After about 10 seconds the glow grows to it's maximum intensity, and the low-pitched hum in both chambers begins growing as well.
Ten seconds of the hum growing increasing louder almost begins becoming annoying, when suddenly the hum is overpowered by the very loud sound of stone scraping against stone. This sound for both groups comes from down the tunnel hallways somewhere and the reverberation tells you that the stone must have been quite large to create this volume of noise. Suddenly, the low hum and the sound of stone crossing stone both stop... and all is quiet in the tunnels once again.