The mole is revealed to be Quinn from Internal Affairs. After the case is closed, Deeks is welcomed back to the team. 📄 The Significance of "The Paper"
💡 While the team "put together" the operation to save Deeks' career and catch a mole, the episode ends with Deeks being told to "sign the damn papers" to solidify his place in the NCIS family. "NCIS: Los Angeles" The Debt (TV Episode 2011) - IMDb Ncis Los Angeles 3x10
Kensi is left in the dark and is devastated by Deeks' supposed firing, causing significant tension between them once the truth is revealed. The mole is revealed to be Quinn from Internal Affairs
The shooting was actually faked to get Deeks back into the LAPD undercover to find a mole. "NCIS: Los Angeles" The Debt (TV Episode 2011)
The "paper" mentioned at the end of the episode is the official document that would transition Deeks from an to a full-time NCIS Special Agent .