as long as part of the cubrian layer is still attached, your plant will continue to grow. your lucky, part is left at the bottom of the branch where it snapped. :weed:
you've done nothing wrong, you will offten get a runt from auto's.
if you have the space, grow it out, it might surprise you.
I allways grow the runts or odd looking plants. i had one northan lights that came from a friend . his mates were doing experiments with giberelic acid and creating...