Snapped branches happen most during low stress training in week three, when the stems are still brittle and one tug too many folds a main cola over. If the break is partial, taping it back in place with plant tape and a small splint usually heals within a week, leaving a knuckle. A repair walkthrough with photos of a healed break, and when to cut the branch off and move on, is on https://turboautoflowerseeds.com. Fully severed branches are not worth saving on an auto.