Schrobby said: Len's butt hurts and Kaito is running away? lulz
and according to the translation got hit somewhere below the waist
*SMACK*"ตรับ" is an onomatopeia commonly associated with something smashing into a person's... nether region. In this case, it's a bit ambiguous just exactly what got smashed.Hwaaargh!Aah~My butt hurts.