Ancient Alien Rulers

The kids laugh nervously. Tadashi raises his voice "Who threw that?". Tadashi stands up and starts walking towards the ringleader Kouta. The other kids get scared and back off but Kouta stands his ground.
"If you ever throw anything at me again I swear I'll kill you" Tadashi said loudly.

"Sit down Tadashi!" said the teacher.
"but he started it" said Tadashi.
"I don't care who started it" said the teacher, "I told you to sit down."