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Yang Yi encountered a bit of an obstacle while learning how to pick locks: he had no real locks to practice on.
Knowing the theory behind many skills is not enough; ample practice is also needed. Lockpicking clearly falls into this category. Yang Yi wanted to become as good as Hank, but without real locks to practice on, relying solely on the principles he remembered in his mind, he could forget about ever achieving that.
Therefore, Yang Yi soon realized that continuing to share a cell with Hank didn't make much sense, given that he knew all the principles but had no real locks to practice on.
Yang Yi had a tough week. He was subjected to George's targeted taunting and humiliation in the special housing unit, and he could only swallow his anger. Returning to the cell and not learning any more useful lockpicking skills from Hank was frustrating.
Owen finally left too. He resigned and was transferred to another prison. The protection Yang Yi had paid for was no longer there.
