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Quick summary: Szayel gets another title page and has been poisoned by using Nemu to restore himself (it makes 1 second feel like 100 years). Mayuri stabs Szayel with his zanpakutou and therefore Szayel will feel pain for a 100 yrs each second.

danna :
Bleach 305

Mayuri approaches Nemu
Nemu : My… dee… pest… apo…logies

After Nemu has finished her line, Mayuri turns to face Szayel

Mayuri : Interesting (grin) so, this is all? (It looks like he’s a bit disappointed)

Szayel : …What?

Mayuri : Is this all you have? The perfect rebirth that you just said. Or do you still have other hidden abilities? Eh? Well, It’s ok. It’s nothing to fret about. Don’t show me that miserable face.

Mayuri moves closer to Szayel

Szayel makes Mayuri’s bankai strike back at Mayuri. Maruyi was smashed. Szayel is in a good mood again.

Mayuri’s Bankai melts

Szayel : …Wh…!?

Mayuri : My..My..You think the instrument will harm it's owner? If by any chance it snapped at me, it would only ruin itself.

At this moment, Szayel suddenly feels (looks) creepy. In his eyes, Mayuri is approaching him slowly.

Mayuri : Nemu’s body is always full of poison. So, the person who eats or penetrates her body will be poisoned. This time the poison was prepared at the place you laid your egg. (He shows a bottle) Yet, relax because it’s not such wonderful one. Let’s just say it is a poison for a superman.
　　
Mayuri : You can see swords of the skilled comrades stop in mid air? The sensation of time is lengthening. It’s sort of a rare phenomenon that sharpens the extremity of the sensations you feel. This is a poison that causes it to happen inevitably. In other words, it’s a medicine that makes anyone be able to control the sensation of a superman.

Szayel : (He is speaking too slow to be understood)

Mayuri : You are understating now, Espada. If you use this medicine, even the infant can see a bullet stop in his eye. The person who becomes a superman like you are surely bored by the slowness of the ordinary person like me, aren’t you? Then..

Mayuri drew out his sword.
　　　　
Mayuri : This is not the great point of this medicine. The sensation’s sharpeness of a mastered person is only a mere second, but with this super-medicine it can empower that result for countless times. One drop of it can be done 25,000 times, but I prepared a special amount for you. Now, you will feel like a second equals a hundred years. In other words, you will see the movement of your surroundings slowly like this for a hundred years by your sharpened senses. How wonderful. Then, compared to the sharp senses, the normal body will fall behind. Transcendently, it’s the sign that the body will be left behind from the sharpened sensation of the perceiving feeling.

Mayuri : Now, feel the pain from my sword go through your heart until your body turns into dust. So then,

Mayuri climax

Mayuri : Goodbye for 100 years.