As mentioned, Hobos and ninjas aren't enemies per se. In fact, they may sometimes join forces. In this case a wandering ninja encountered a Hobo baby abandoned (or simply confused as to where the nearest train tracks lay) on the side of the road. The ninja took the Hobo lad under his wing and taught him the noble way of the ninja. The result is the slightly-more-deadly Hobo-ninja. Not only is he entirely undetectable by anything ever, but he is COMPLETELY UNPREDICTAFATHOMABLE!