Operation Gnomeregan issue

The quest of retaking Gnomeregan has an issue about when players assault the tunnels. The continued battle ends when taking the tunnels because the large trogg never comes out. It glitches and people just have to go back to where High Tinker gives his speech.

In simple terms the Operaiton Gnomeragen quest is glitched and needs to be fixed. Some say if you go into the tunnels it glitches the quest. Others say stay behind the High Tinker. Blizzard fix this glitch, some people had to wait 3 times to reset itself just to finish this quest.