Sayaka has fallen and ironically the only person to save her was once an enemy.
Much as I expected, the witches are created from the Puella Magi. As their soul gem becomes more and more corrupt, they are reconstructed into becoming a witch and essentially perish.
According to Kyubey, this is a needed ritual to sustain the universe which is rapidly draining all the energy at a rate that cannot be replenished easily. In order to combat this, Kyubey’s race/culture have developed a device to harness the powers of the human emotion. Grief and hope power the soul gem and when the girl (I assume that they are considered more emotional) mutates into a witch, the energy is recovered by an Incubator through the Grief Seed.
Sayaka has become a monster and it is up to Sakura Kyoko to save her. In a rather ungraceful manner, she sacrifices herself to stop Sayaka leaving Madoka with Homura. It is now only Homura who stands against Walpurgisnacht where we we likely see the gear witch from the beginning of the series.
Again, there really is not much to say. Everything is spiraling downwards and the root cause of this are the Incubators. Kyubey is not a singular entity at all, there is an entire race of these monstrosities. The logic behind their doings is not even sound. Yes, when fire eats away at a log, energy is lost in transfer. This is very true but at the same time, I doubt that the energy disappears entirely. I’m fairly certain that a planet is able to recuperate this lost energy. It just feels a bit insane. There must be an alternative to tormenting humans for their juicy emotional energy.
I would like to pose a question. How does a race as advanced as Kyubey not have emotions? I thought that would be a requirement of any sentient being. Perhaps it’s a hive mind? In their long journey to search for a suitable energy source, humans were to only beings to have emotions. That’s a bit far fetched isn’t it? I don’t even fully understand how the concept of emotions creating energy works. Wouldn’t there also be a loss in the transfer as well? I’m willing to bet that all of this could have been avoided had the Incubators created a tool to harness happiness instead of grief. That’s much more productive and abundant. Stupid alien cat demon.
It’s also saddening that Sakura who held such a cold demeanor became such a warming character only to die to the one who opened her eyes. For her friend, she sacrifices herself in one last attempt to redeem her values.
What’s worse is that Homura’s left completely alone. If Madoka is left alone, she will likely break mentally and everything will be lost. I think that Homura cannot show emotion towards Madoka because the lack thereof creates a barrier between Madoka and the Incubators. Homura is much like Mami in that she probably wishes for Madoka to aid her. However, Madoka cannot be allowed this privilege. She is to steep in the overwhelming despair forever for the benefit of the rest of the world.