It might refer to that Stormpike ramrider or whatever it is called… At least that’s what I would guess — it’s one of the more threatening mobs there. But then again, I’ve said many times that Alterac mobs can be notoriously unforgiving for many parties.
I would recommend either my ‘Holy-Human’ team or a Nature-Dragon hybrid (Malfurion, Guff, Bru’kan, Yu’lon with Pearl, Sinestra and Nefarian — this particular combination has a good colour distribution for various opponents) for climbing in Alterac in general, unless you need a very specific combination for the boss (e.g. for Drek’Thar my suggestion is Mutanus-Diablo-Geddon). I haven’t tested the latter for Ravak, though — maybe one could do it with Nature also on Heroic, feedback would be appreciated.