He engages Aizen in battle and, with the combined efforts of Soi Fon, Kyoraku and Shinji Hirako, is able to stab Aizen through the chest. However, it is quickly revealed that Aizen had been using his zanpakutō's hypnotic abilities since the start of the fight, thus tricking Hitsugaya into stabbing Momo instead. With Momo fatally injured, Hitsugaya attacks Aizen in a blind rage, only to have his arm and leg dismembered, falling to the ground with Soi Fon, Kyoraku, and Shinji.