We gave the sparrow a few minutes to become oriented again then took him outside to release him. We walked over to the Arborvitaes on the north edge of the property and Derek opened his hand to let the bird go. The sparrow just sat there on his hand like he wasn't sure what to do next. My bird book said that this species will not fly from a threat but will run off instead. I picked him up from Derek's hand then let him go in the air and he flew to the top of an Arbor vitae and chirped at us a few times. It was hard to tell if he was cussing at us or thanking us. We wished him well then went back inside. It was a very interesting few minutes we got to spend with this cute little bird. I hope he survives his head injury without complications.