Mr Roach (20), captain of the Otago men's amateur golf team, received deep puncture wounds to his left thigh and left buttock in the incident, which occurred about 9.30am on Saturday on a station near Naseby.
He has already ruled himself out of the North Island amateur championship golf tournament starting later this week and is expected to take several weeks to recuperate.
Speaking to the Otago Daily Times yesterday, he said he encountered the stag as he and two friends - Sam Foster (20) and Craig Turnbull (19), both of Arrowtown - stalked three hinds across a scrub-covered station near Naseby.
All three had experience hunting deer, but it was the first time they had encountered such an aggressive stag.
Mr Roach said he had just fired a shot at one of the hinds when the large stag ‘‘popped up'' from a hiding place in tall tussock about 5m away and charged, impaling him and pushing him along the ground.
Mr Roach clung to the animal's antlers until it fled, and received a 12cm-deep wound to the top of his buttock, a 5cm-deep wound to his thigh and cuts, scrapes and bruises.
He said his injuries could have been worse if he had not turned his body at the moment of impact. The wound to his buttock had only narrowly missed his spine and the antler that struck his thigh could have easily punctured his stomach, he believed.
‘‘I was pretty lucky. There could have been some real bad things that happened,'' he said.
He was ‘‘in shock'' when he checked his injuries and found ‘‘heaps'' of blood coming from his wounds.
‘‘I was just screaming and swearing. I was in quite a lot of pain,'' he said.
Mr Roach's friends raised the alarm and he was given two doses of morphine by St John Ambulance paramedics before being flown to Dunedin Hospital by rescue helicopter.
He was treated and discharged later the same day.
Yesterday, Mr Roach said the stag was believed to be a 14-point animal and ‘‘about the size of a small horse''. He believed it had been startled from its hiding place in the tussock by the shot Mr Roach fired at the hinds and had been trying to flee.
‘‘He just hopped up and looked at my mate Craig. Then he looked at me and decided the best way out was down hill, straight at me.
‘‘He just put his head down and put his antlers down and ploughed me over,'' he said.
Mr Roach's wounds were checked for antler splinters before being bandaged at Dunedin Hospital.
He said he hoped to be back playing golf at the South Island amateur championship in Invercargill, starting on March 29.
