I'm alliance but I'm very familiar with macros, so I might be able to help, but I need some info.
What is the name of the item you use to summon Frostbite, and do you have to right click Frostbite to ride him? If so, is he a vehicle?
There is a script to dismount vehicles, it's /script VehicleExit() so if you hop on the tiger automatically it'd be very simple to make a cast sequence macro to mount/dismount. If you have to use the item and then right click him, you could probably use the same macro but press it a little slower. Once to summon, once to exit.
PS- There is a quest with the same exact name for Alliance, from the same exact NPC (Bronzebeard). However, the objectives and quest chain order are different (not so much the objective, there's 2 for this quest and only 1 is different and even then they're just reworded, the second objective is the exact same).
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For reference.
Looking at the comments for the Alliance one, mobs DO spawn, so perhaps this can be done by alliance. NEED SOMEONE TO TEST! Might be me when I get to that zone, not quite 80 yet
