Burkhart-san countered Erwin’s comments with a contradictory point of view.
“It might be unknown to what floor we have to ascend. Combating is quite efficient. Especially me, the boy and Elise.” (Burkhart)
Elise and I can use healing magic and Burkhart-san can transfer his mana to others.
Fighting while saving mana to the utmost, depending on the situation it ought to become necessary to have a compulsory nap of around three hours.