Bleach Episode 233 is titled “Teki to natta Zangetsu” means in english “Zangetsu Becomes an Enemy” is release on August 18, 2009. This Bleach episode is have a english sub.
This episode: Muramasa sends Sode no Shirayuki away, and Ichigo asks why he wanted the zanpakutÅ to gain independence over the Soul Reapers. Although he does not give the reason, Muramasa replies that zanpakutÅ can separate themselves away regardless of being the soul of a Soul Reaper, and he is a good example of one. Ichigo cannot accept this view and attacks him. Muramasa uses illusions to overwhelm Ichigo and pins him to the ground, where he proceeds to drag Zangetsu out of him. Once Zangetsu manifests, he immediately attacks Ichigo.
Source : mega video and wiki