I know people around here don't believe in HR when you have a power meter but its also worthwhile to see if you were redlined regardless of your power output. Its too simplistic to say "I just wasn't fast enough". There could have been confounding factors such as temperature, hydration, fuel, illness, etc. I've had races where my NP was well "within range" of an easy ride but my HR was through the roof.
Secondly, I'll add to WR's use of the AWC and say I draw a line at FTP also and look for long periods of time at or near FTP *BEFORE* a VO2 effort. For me, anyway, I would be "pre-blown up" and then try and jump which would elicit spectacular levels of blowing up.