Mayuri, having observed Szayel's abilities through organisms implanted in Uryū's body, counters by replacing his organs with artificial ones, then gains the upper hand by releasing his "bankai" and having it consume the Espada.
Mayuri, having observed Szayel's' voodoo doll'abilities through bacteria implanted in Uryū's body, counters by replacing his organs with artificial ones. He gains the upper hand by releasing his "bankai", which consumes the Espada.