Awhile back my friend and I were discussing this trend in the media. It seems that the more ninjas, or assassins, there are the less powerful the ninjas are. However, as the ninjas are whittled down they grow ever more powerful. Now, you could argue that its because the person they are fighting is getting tired, but the problem with that notion is that there is usually no showing that the person they are fighting is getting tired. My theory is that a group of ninjas are like Highlanders. The ones that live get the abilities and powers of the dead ninjas, but that is just my own head canon. What prompted this post is a scene in Into the Badlands wherein four assassins tried to kill the MC and the first 3 got dispatched with ease but the last guy took a long time to actually die. What are your thoughts as to why this inverse law of ninjas exist?