The plant will survive below the break, and will concentrate on the nodes below and repairing the Main. Definitely will suffer some growth due to being am Autoflower on an 8 week time frame. Autos are not as forgiving due to their short Lifespan, I usually don't extreme cropping, and I even go easy on topping and exfoliation due to this. In the end, undue stress takes away from the Yield.