"Mount Zinit - Another Missive From Otomai" Please help

Hello! I am doing main quest, now I am on mission "Another Missive From Otomai". There I found problem. It says what I need to defeat Young Drheller and Trained Drheller, but I don't know where are they. I can't move for a long... Pls help
 

Guys, It was glitch. Now all ok