Irisviel senses another intruder and that intruder is none other than Kotomine Kirei. I have a stupid grin plastered on my face now knowing that this episode is going to be so effing good. How can I not get excited? Kiritsugu is already busy with Kayneth and to have Kirei in the mix is just like icing in the cake.
Irisviel who knew how Kiritsugu feels about Kirei however won't let Kirei go through without a fight. She instructs Maiya to stop Kirei from going any further but I think the both of them are underestimating Kirei. However, once again I am surprise that Kirei comes down to the place himself instead of sending out his Assassins. I guess the thought of him facing Kiritsugu face to face excites him just as much as it excites me.
But lets us go back to the mansion and resumes the Kiritsugu versus Kayneth's fight. Kirei used the "Origin Bullet" that managed to penetrate the shield Kayneth put up and thus wounded him. Too bad the bullet went through his shoulder and not his heart. Heh, served him right for lowering his guard against Kiritsugu. The fact that Kiritsugu is using human-made weapons further enrage Kayneth.
he won't be smirking for too long
Like I said earlier, Irisviel and Maiya were underestimating Kirei. There is no way he could be taken care off that easily given his background but hey, Maiya thought she did it and BAM! Kirei wakes up from the "dead" and starts attacking her. He is fucking immune to the bullets, believe you me! Needless to say, I am fangirling for Kirei as he kicks Maiya's ass. Maiya would have been dead too if Irisviel didn't interfere. Irisviel used a magic trick Kiritsugu taught her: Shape Ist Leben. It works at first but once Kirei focuses on his mana, Irisviel knows he's not a match for either one of them. What Irisviel did just piss him off further which is not good. Not good at all... for Irisviel and Maiya that is but it's funner for us! heh. So what did he do? He fucking stabs Irisviel in the guts with Black Key just to ensure that her blood is red as well. Awesomeness.

It is baffling for him to see these two women challenging him not for their own accord but for someone else and thus makes him even more intrigued about Kiritsugu. What does he has that makes these people protect him? His brain is in denial though trying to convinced himself that Kiritsugu is the same as him, alone and empty and understood by none. Poor Kirei...
For those who are Irisviel fans, worry not. She would not die from that would. She is a homunculus and Kiritsugu forces her to carry the Avalon, a Noble Phantasm that heal the wounds of the bearer. In layman's term, Avalon is just Saber's sword scabbard.
Having faced Kirei herself, Irisviel is more determined not to let Kirei meet Kiritsugu. She is well aware of how dangerous he is. But here's the thing Irisviel, I don't think you or anyone else besides Kiritsugu (and Gil) is capable of stopping him.
Next up is Saber/Lancer against Caster.
I read that in a totally perverted way
And thus, a thought then crossed my mind. Since Caster is so obsessed with Saber, I think he will go berserk if Lancer and Saber start banging each other there and then. That should distract him, no? lol
Anyway, Lancer and Saber manage to destroy the Noble Phantasm and thus destroying the tentacle monsters as well. Caster then runs with his tail between his legs.

It is a perfect timing though because Lancer senses his Master is in danger. Knowing that it's her Master's doing, Saber urges Lancer to rescue Kayneth.
And then the episode takes a turn where I was left completely clueless. Well, almost. Thanks to Reiki's explanation I managed to grasp a thing or two. It looks like an explanation of where did the Origin Bullet got it's name. Some woman Magi powdered Kiritsugu's rib into the bullet and his origin will materialize in anything shot by it. It is especially powerful against Magi for when they used magic against it, his origin will destroy their Magic Circuit and left the Magi without control of his magic. The more powerful the Magi, the greater the effect which mean bad news for Kayneth because it is pretty much DEAD END for him. Kiritsugu would have killed him too if Lancer didn't come to take his Master away.
so damn cool all the time
Interesting we found out that Kiritsugu's origin is severing and binding instead of destroying and regenerating as I first assumed. I also learned that the woman in question was his sensei Natalia and she made 66 Origin Bullets for Kiritsugu. I think he wasted one on Kayneth earlier.
To be honest, I was quite disappointed that neither Caster nor Kayneth is dead. I thought it was the end of both of them but I guess they want to save it for the second cour. Oh well, good things happened to those who wait I guess.
Looks like the next episode would be about Lancer, Kayneth and Sola-Ui. Should be interesting judging on the conversation they just had ^_^