I would not worry too much about a few leaves being torn off or the stem being bent. It appears you still have enough good leaves for the plant to continue photosynthesis and feed itself. MJ is a virogous plant and you really have to TRY if you want to kill it. As for the light cycle, yes definately something to worry about. Inconsistent light cycle will stress the plant out which will make it more prone to becoming a hermie.

GTD