SHEBOYGAN, Wis. (WHBL) - A Sheboygan man is going to prison for throwing a knife into the back of another man during an altercation stemming from a drug deal.  18 year old Stephen Mason was sentenced recently in Sheboygan County Court to a year and a half in prison to be followed by 4 years on extended supervision.  The incident happened last August in the area of 10^th and Georgia Avenue.  Authorities said the victim had arranged to purchase marijuana, but there was a disagreement during the transaction.  The victim told officers he was running from the area when Mason threw a knife, hitting him in the back.  When officers arrived on the scene, they found the victim barely able to stand, with a large knife stuck in the middle of his back.  Mason was arrested later at his home.  The victim suffered a collapsed lung and a broken rib.