K must have invested ~2 hours into this fight with similar failures (and curse words) each time, until the game finally got put away with sorrowful regret. Then enters a new sheriff in town, my brother LDK. He and his girlfriend came to visit, and we spent a relaxing, non-assuming weekend of playing video games and watching movies. Being a huge lover of RPGs (but without the income to buy an XBox 360), LDK was eager to check out, of course, Lost Odyssey. Over the course of a couple of days, he quickly reached the shelf-level event and promptly beat the snot of the sandworm twins on his first try. O_O
What was his secret? A) K said my brother was extremely lucky because the rainbow insects weren't as aggressive that time and B) my brother uses the magic of the A button. The way LDK puts it, "You just wildly run around the map in crazy circles, while madly pushing A-A-A-A-A-A-A-A like your life depends on it." That way you'll find any hidden secrets, spells, and potions in every possible location. As LDK's girlfriend puts it, "Yeah, I couldn't watch him play games at first. It's like following a super-speed Roomba with a case of vertigo."
K has graciously combed through his old game shelves to provide a few choice examples of shelf-life events, so more on that next time!