Theory about Konohamaru
So here is a couple things that I noticed
1. That the creature behind Pain lets go of one of the person's tongues, because he was passing judgement. Pain let that person who told the truth LIVE. WTF??? haha.
2. Konohamaru is watching this... but the Creature IS NOT in the frame... THIS means that the creature can only be seen by the person casting the jutsu and the people under its influence... just like the "death god" jutsu that sealed the 9-Tails... OR it could be a genjutsu of some sort...
Also... remember that Ebisu was Konohamaru's sensei, and that he was always trying to escape from him. Considering that Naruto couldn't even hide from Ebisu, Konohamaru had to have gotten pretty good at running and escaping from the grasps of Ebisu.
I think Konohamaru's mission was to spy on Pein and to gather information. Because hes a genin, and thats what he is good at. Hiding and escaping