At what point did Sam take part in a bribe? His response seems to have been a genuine mix of confusion, shock and "I assume this is a joke right?". Ultimately h

At what point did Sam take part in a bribe? His response seems to have been a genuine mix of confusion, shock and "I assume this is a joke right?". Ultimately he went to arrington when it was clear the idea of a bribe was serious. How else should he have reacted?