Questions: Does it usually take that long for a falcon to prepare a feeding?
It can do, especially if there is some nibbling involved - heads (or what's in them) are adult delicacies for some birds. They take off head, wings, sometimes legs, a bunch of feathers then bring it in.
Don't they usually bring food into the nest already prepared?
Depends on the age of the chick. Younger chicks food usually comes ready-to-serve. Older birds, they will just drop off in some form, usually with lots of feathers for them to figure out what to do with it ....
Love the falcon cam--I see new things every day!
New dead things in particular - good identification on the blue jay!