Hypothetical: Three suspects act together to commit theft (500-1500). Evidence is developed to charge all three suspects (S1, S2, and S3). As the hammer begins to fall on the three suspects, S3 offers to pay unspecified amount of money to S2 if S2 agrees to take all the blame for the theft. S2 gets wise and tells police about S3's scheme.

Question: Does this fit Tampering with a Witness (PC 36.065) considering S3 and S2 are co-defendants in the same charge? In other words, can a co-defendant be a witness in the context of this scenario for purposes of PC 36.05?