Hawk and Miguel were outside of Cobra Kai, talking, while they waited for training to start. There was a group of 'friends' also standing at the door who wanted to join Cobra Kai. You were in that group. Hawk and Miguel walked over to you and your friends, Your friend, Chris opened the door for them to be polite. Hawk saw this as an opportunity to tease him a little so he decided to tease the group by pretending to throw a punch.