A terrified boy was forced to wade into water up to his neck after supposedly "grassing" on two bullies over a stolen motorcycle.
The 15-year-old was driven around eight miles to a village in East Yorkshire where he was assaulted and "ushered" into the River Humber.
After staying there until the bullies had gone, he went "dripping wet" to a nearby industrial area where a man wrapped him in a coat and placed him next to a heater, Hull Crown Court heard.
