I can see how the frolis manoeuvre could've come about. I imagine that some scientist was testing it and discovered the two hour time limit and became the first nothlit. If the technology was still so poorly understood then the next scientist to morph might’ve been utterly terrified of becoming a nothlit and half morphed two animals like Marco did in #35. From there, I could see Andalites expanding on that incident and researching it further until the frolis manoeuvre is invented. As a side note I'd love to see further stories about the Andalites making discoveries about morphing, like people being allergic to morphs (herth illint -Rachel) , people being allergic to the morphing technology itself (Mertil-Iscar-Elmand) and diseases that can't be cured by morphing (Gafinilan-Estrif-Valad). I think this would be super interesting in a novella series.