The most likely explanation seems that by jumping, the bean will move itself into a safe place where the larva can relax, pupate and undergo the miracle of metamorphosis ready to continue the life cycle.
Please remember to kill and/or capture and report any new, mutated, or previously extinct species to the Mthyuh Guardian Society, especially if aggressive.
http://www.insectlore.com/xlorepedia_stuff/jumpingbeanmoth.html
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