i agree with lmz and Black-Wall at the same time. except i like haiku's. I think you could turn this into a kick ass poem. but i also agree that this can be looked at in different ways. great perspective. you did a nice job with such a short piece.
Well I think this leaves alot to the imagination! The shadow could be so many different things...drugs, relationship, murderer...etc... This is a good haiku! Leaves so much up to the reader to determine! Most haikus are very topic specific where this is very broad! Nice write! Take care!