The nozzle clumping:
Just had to shake my head when this notification came in 
I guess it’s just a bit odd that the printer doesn’t realize “hmm, strange that I’m unspooling half a roll of filament in the middle of this print.”
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I feel your pain. I’ve had this same thing happen after forgetting to reseat the PTFE tub into the head on a PS1.
It’s been awhile since this happened but I think I remember using the “Filament unload” function to respool the filament.
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Been there, done that 
Unlike @JonRaymond , it was after a mid-print heat creep troubleshooting and I caught it quickly.
I could just manually push it in bit by bit and the buffer took care of the AMS pull-back.
But with that amount of filament…
& 
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