You mean the most irresponsible thing to do was to release him.
Aside from not being humane to a captive animal do you realize that snake owners already have a bad reputation and that what you are doing does nothing more then add to this reputation in a negative way?
Do everyone a favor be prepared next time around, if your snake does not eat the prey you are offering either euthanize the prey humanely, have an enclosure ready or return it to the store.
Learn to be a responsible keeper.