Why no balloon platform in Grobb?

Yea those blood gorgers in the tunnel are eve na nuisance to a 80. I usually use my warden animal charm on one of them and have it kill the other, and just keep running into grob. Next thing i know a treasured chest drops on my head and both gorgers die. That was funy too because i was all the way back by the gator trainers when it happened. I forgot all about them and next thing I know a chest drops out of the sky and impales my poor ratongas head.