Owls do not have a “pack” mentality and are solitary so one owl is usually the only one attacking. However, their talons and beaks are strong and a panicked owl who gets entangled in human hair can lead to deadly consequences.
While one owl usually attacks and is a female, there can be a mate with her and he will also join in the attack especially if there are owlets present. A male owl is larger and can inflict more damage to a human.