I was attacked by a huge owl recently. It drew blood, and really hurt. I can confirm it was entirely silent, in contrast to being attacked by a crow, which makes an almost-avoidable swooshing sound.
Yes do you remember this owl? https://www.theguardian.com/environment/2015/feb/06/owl-atta...
But most owls nest in big threes high above the soil, so the probability of an attack is really low. Probably there was a fallen owlet hidden close to you.
https://www.knkx.org/post/owls-attack-people-being-swooped-s...
https://www.pbs.org/video/film-school-shorts-program-owl-and...