A couple of years ago I watched a singleton in Michigan, I mentioned him before and we nicknamed him Sumo ...cause he was a little heffer

Anyone one day there was - unbeknownst to us, a falcon intruder near the nest box. Sumo had jumped out of the nest box while the parents were out of cam view and then mom cam back and started freaking out trying to get him back into the nest box.
Of course, we were all thinking she had lost her mind and was trying to hurt him - she couldn't figure out how to get him back in so she grabbed him by the cheek (he was a few weeks old at the time) and just hauled him up into the nest box cutting his cheek in the process.
Later on, the people that manage that site told us what was going on out of cam range so mom was just trying to get him to safety with her where she could protect him. Later on - dinner was served and it was the 'falcon' intruder...that part was tough to watch.