My friend is reluctant to press charges for a serious assault in which he received a smashed tibia. This occurred some seven weeks ago at his pals house. A slanging match developed between him and his friends house mate whereupon he received a punch to the face, he took his jacket off, squared up to this guy and then received a punch to the nose followed up by a powerful kick to his tibia just below the knee. He was very drunk at the time whereas this guy was sober and in control. His doc told him that the fracture could only have been caused by a high energy impact. This has convinced him to press charges but he is worried that his own past will come back to haunt him. I have told him that that this is a completely different scenario. His friend agreed to go witness for him and says he saw him strike him first. Surely the defence cannot use his past against if it went to court? Is there any legal eagles here that can offer any advice?