Mifune drinks hard, yells, and he is the coach of the losers.  His methods are ancient and he pushes the campers to the mental and physical limit.  But there may be a method to his madness.
What are you doing up here?
¿Qué hacen ustedes aquí?
No, ¿qué hacéis vosotros aquí?
Eu que pergunto o que vocês
 estão fazendo aqui!