While doing the mission for the eris urn bounty I was able to land on the Ogre and stand on him for 26 Seconds. Challenge is on guardians
Here it is from a second angle: https://www.youtube.com/watch?v=1Em_St3dee0
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you should yodel while doing it....epic, there should also be Grimoire cards for stuff like this plus sliding through the Ogres legs exiting majestically all while leaving a firery phantasm of yodeling chaos