I use the following, and it works perfectly if you position yourself correctly.
I have my entire raid on Chase and just position myself In front of where Griklor is Pathing. When he emote's, your toon will run to Griklor....And I have another Hotkey which I press which will make the toon run back to me. This way you can always ensure the toon will run into the aura.
Fairly easy to get 100% success with the emotes which make this raid pretty basic.
[GriklorChase]
trigger=#*#Griklor the Restless roars and points at#1#.
command=/if (${EventArg1.Find[${Me.CleanName}]}) /multiline ; /rsay Chasing Griklor; /docommand /boxr pause; /nav id ${Spawn[Griklor the Restless].ID}; /stick on /timed 26; /timed 100 /docommand /boxr unpause
[/CO
[/QUOTE]