Being burnt to that extent is terrible, I'm glad he survived although it must have been difficult for him and his family.

My sister has a friend who was a paraglider and a few years back he lost control and collided with an electricity pylon. He survived but sustained 3rd degree burns to almost 70% of his body. He is still healing years later - it's a long road to recovery.

I'm sorry you had to see your teacher that way, hopefully there will be good memories with him in the future that will replace those.