Sparring (Checks and Christina Bg, can skip)

"What?!" asked Checks with a frown on his. "What do you mean school for assassins?"

But it did not look like Christina was still listening because at the sound of the whistle, she tilted her head and stared far and long like she could see something else from the distance.

"What are you talking about?" he tried again.

"Keep quiet and follow our lead. I'll explain everything later."

Annoyed, Checks tried his best to imitate the position of the people in front of him. They moved according to the whistle, huffing and shouting out their breaths just like how he saw people do in movies. He thought that it was ridiculous so he kept his voice low as much as possible.