When Spencer becomes Jimmy again as he breaks open he vault with the girl trapped inside, is he really like his old self? Why or why not?

The character, Jimmy has change he breaks the safe in the bank so that he can save the life of the little girl. Spencer sees this act as a proof that Jimmy has changed

Explanation:

"A Retrieved Reformation" is a short story written by the famous American author O. Henry. In this story the author talks about the reformation of the main character jimmy who is a criminal (i. e. a professional safecracker) into a honest man but at the end of the story jimmy's reformation is threatened when his criminal past is reveled in a an attempt to save a little girl who is locked in the vault.

Thus we can say that

The character, Jimmy has change he breaks the safe in the bank so that he can save the life of the little girl. Spencer sees this act as a proof that Jimmy has changed