...And he wants change back from the cab driver:

After arriving at the shopping center where Rep. Gabrielle Giffords' was holding her event, the suspect said he did not have change for the fare. He and the driver then went into the supermarket to get change. After the transaction, the two men walked out of the store together and separated.
Am I reading this right? He was actually worried about the change? He didn't let the cab driver just keep the change? He was unable to see that the change mattered zip at this point? I must be missing something.