A TEENAGER has been convicted of stabbing another boy multiple times in Grays. The 15-year-old victim suffered a collapsed lung and a severed tendon in one hand after being stabbed through the upper arm and into his chest. He needed surgery and may suffer potential long term damage to his left hand following the attack on King George’s Field, known locally as Blackshots Field. He was walking across the field near Jesmond Road, on March 15 this year, with his girlfriend when they saw a 14-year-old boy they recognised. As they walked past him, the defendant called out to them and attacked the victim with a large knife.