I need to hunt the elusive tiger Yellowfang with Bax. I need to signal to Bax that I am ready to hunt.
Right click Bax and "Signal to Bax". Then lead him over to ( 224, 61, -569 ) /waypoint 224, 61, -569 where there is a NPC Yellowfang waiting. Get near Yellowfang and he will attack as a level 74 mob. Kill it, then Bax will walk back to the waterfall and will be ready to talk to you to finish the quest.