What is the flankers job and running lines out of the scrum?

Answer 1

The openside flanker has to mark the oppositions out half and scrumhalf (no 9 and 10) off a scrum. The blindside flanker joins at rucks and the breakdown and guards the blindside of the scrum. They both push in the scrum and as they are the fastest of the forwards they are usually the first people to charge into a ruck and gain or keep posession of the ball. By running lines out of the scrum I think you mean carrying the ball and running around and through opposition players, this is more usual for the number 8 out of a scum.