Nothing like a good re-kit effort...
I was thinking the whole time "dude throttle back", and sure enough something came off the plane. Dumb. Do your trimming at 1/2 throttle, and make multiple med-alt passes with gradually increasing speed so you can check for flutter. If the throttles aren't at 100%, you should be able to hear flutter before the plane self-destructs, and also parts falling off at lower speeds may not cause fatal damage either.
I doubt he learned the real lesson though, even though the guy coaching him was telling him "take your time".