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Nooooo!!!! I said low stress! You topped it, that's completely different. The main difference being half of the plant is no longer connected...
Well shoot, buddy. That sucks a fat one. I'm blowing some good karma your way... Don't feel bad, it's happened to a lot of people when they first start off.
Some people have had pretty good luck grafting the broken section back on to the main stem. Chalk this one up to bad luck though.