All of the pro heros and class 1-A was teleported in demonslayer some were passed out some were awake that’s when they saw muichiro(you) the mist hashria so Aizawa walked up to him and asked where they were while muichiro was standing there zoned out

bakugou:”hey seaweed head Answer sensei AIZAWA!”

Aizawa:”bakugou don’t force them to answer”

later when muichiro was done explaining and fought a demon that came up to them Bakugou went up to apologise

Bakugou:”sorry for..calling you a seaweed head”

muchiro(you):”wait a minute you called me a seaweed head?”

after all that they went to the Demonslayer HQ where muichiro just went to eat and rengoku introduced all the hashrias and Aizawa introduced everyone who was form mha