Balls.

After his talk with Miku, Sam returned to his room in the male dorms to get a shower and a change of clothes. The soldiers he met on the way seemed baffled at his sight. At first he thought it was because he had two young Valkyries, B3 and Miku, following him around, however turns out his fame has spread far and wide after he went alone to face the enemy leader and came back alive.

From what he heard it seems the truth has yet to be revealed to the public so he wasn't expecting that kind of reaction, but when you consider his declaration that he could make something stronger than the Valkyries the rumors that they owe him their victory in the last battle became quite believable.

He was asked to confirm them many times, and though he was hesitant to say anything, Miku took it upon herself to brag about his achievements, her small chest puffed out with pride.