The glassbeak sped through the grass, hopping and whipping its neck and chest down exaggeratedly as it hit, spinning back and forth and rearing back, trying to throw me off. It didn't try to peck at me while it ran and I assumed it got disoriented when it did, as it nearly fell the one time it tried. Anytime it stopped running and tried to buck me off, I would make efforts to jab it in the eye. I found it easier to lock my legs at such times than I did while it ran.
It caught on to this tendency pretty quickly as well, and soon it was off and running again, shaking its neck and chest back and forth as it went. My grip slipped bit by bit from the pounding, and the beast soon got a sense of when I would try to pull myself in and reacquire my grip to spin around and begin running again. The centrifugal effect of its spin made it impossible to readjust my hold and I could feel my arms growing weaker.
The only thing giving me a desperate hope was that, with every spin I would see the end of the staff swing by, so I knew that it was still there lashed to the one leg. The beast had chewed on the staff when it was lodged in its throat, so I supposed the whip was wedged in some gap in the surface, holding the staff there.
There came a point where I knew that if I held on any longer, then when I DID drop off, my arms would be too weak to offer any sort of defense. The monster was also tired out from all the extra shaking and jumping and such, but not nearly so much as I was.
It started running again and I took several deep breaths and the first time the creature shook me to the side I let myself fly off with some semblance of control.