When you compleate the Grandmother Quest Chain. Thrall is going to Nagrand. When you have completed the chain, everyone in Nagrand hears drums, and the Orgrimmar Music. Then Thrall yell that he is coming. Then you have to wait in Garadar until he arrive if you want to see him in Nagrand. When he is there, he talks to Garrosh Hellscream, then he talks to the Grandmother, then he go and show Garrosh Hellscream how Grom Hellscream did die. Then it shows a little "Spirit show" on the ground, in the circle just down in Garadar (see picture and Video). Here is a video of the "Spirit Show"(Not my video). The pictures is "Screenshoted" by me
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Creature: Garrosh - Thottbot: World of Warcraft