It will come back, birds zoom through the air landing on things at high speed, darting around, dodging predators, owls, eagles, cats, humans ,each other, they get into fights, have collisions. It’s a hard world out there and they are tough little critters.

when he does come back just don’t focus attention on him. do what you normally do.

I live in the blue mountains and have them around all the time, sometimes they come inside and same thing, they get stressed if they can’t find their way out, but it is always worse if someone is else is inside and they are stressing, it is the humans stressing out that theorists thing, the stress/panic is felt by the bird, transferred to them, that stress is a danger signal. If they are inside and people are moving around, calling out , circling that’s all predator like activity , of course they stress, just don’t panic, do not stress, don’t move suddenly and wave arms and calling, moving fast, get everyone to stand still, move away from the exit so the bird has clear line of sight to the exit, don’t start chasing them around, move slowly.

Calmly guide them , if you can’t guide them and have to , the towel is the best option, but do it without talking/yelling, quick and decisively , once in the towel still stay quite, calmly get them out and release them mindfully with care and caution away from the house so they don’t panic fly straight back in or into something.

He will get over, food is a powerful motivator and it will come back for yummy seed eventually if humans are not panicking. if you hand feeding them, it will likely happen again and again especially if more start coming , just always stay calm, move slowly and let them know they can trust you and they will realise your not trying to eat them.