Great news! Glad the feather came out on its own and that Bennie is doing good. And now if it happens again you'll know what's going on and what to do about it .

Also if you ever wake up in the middle of the night and he's flapping around in a panic (night terror), that is something tiels are prone to as well. I'm not sure if they hear a noise or get startled somehow, but will suddenly flap and then get panicked because they can't see and flap all over the cage. Get a light on if that happens, when it happens with Dawn I leave the light on for about 5 minutes and let her get calmed down and back on her perch where she sleeps. Also check at that time for any broken blood feathers, because night terrors is a more common cause of the broken feathers. Once the bird is settled again you should be able to turn out the lights and go back to sleep. Some people like to leave a night light where the bird is to help prevent this from happening so easily.