Being curious shouldn't be a bannable offense.
From the rules:
"If you are profiting of any in-game advantage that shouldn't be happening normally, its a bug exploit"
He didn't profit anything from it. One could even argue that he helped checking that nothing that could give people an advantage can be found there (for example tank and spank boss with loot [killing Elegon without killing Spirit Kings would be a nice exaample of this]).
On the main topic: Some fixes would really help. The RNG is extremely tiring to deal with.