That's a little easier said than done, kinda hard at 2:00 am.
Sometimes you have a willing recipient lined up and they change their minds when you call.
Same thing with trapped hogs, I will hold them live for a few hours for people, but then its lights out. If the weather is too hot I will kill them, I won't leave them in the heat.
Regardless of the final disposition, they will die before leaving my custody. I do make reasonable efforts to give them away, but in the end...they will die.