what should i do my cockatiels eye is red and swollen?

my cockatiel playfully bite my partners toe last night and my partner by reaction kicked the bird and the bird went into the lounge and then fly up to the pillow on the lounge. he was shaking he s head a bit at first and then feathers fell out but on one particularly eye is all red and swollen around the eye and half close.little water but not much.
my cockatiel acts fine talking, walking , flying ok- just squinting sometimes eating and drinking ok.
i worried if i should do something it doesnt look good.
wondering if i can have your expertise on this matter ..
thank you