I've been trying to get to the Cult of the Vault symbol that's "under the platform you drop down from to enter the arena with Terramorphous" (description taken from this question), and have found some videos showing how to get to them if you have a friend in your game. However, I mostly play alone, so the trick shown in the video isn't really an option for me.
I've tried to get Terramorphous or his tentacles to knock me up to the symbol, but haven't had any success so far. Has anyone ever got to the symbol while playing solo, and if so how? Does a reliable method of getting knocked up to the symbol by Terramorphous even exist?
Edit 12/25: I'm playing on the PC, so I also don't have the option of using a guest player in splitscreen to reproduce the trick shown in the video.