Ireland had just landed a fantastic 50/22 from a kick by their winger. England closed the gap at the resultant line out and Ireland were awarded a free kick. They couldn't kick it into touch as they wouldn't get the throw in, it was probably too far out to tap and go and they chose a scrum at which they got penalised. Couldn't they have simply retaken the line out still with their throw in or do the laws not allow that? If so, that seems grossly unfair to me as their scrum was being splintered by England all game long. Or did Ireland simply just make a big mistake?
Thanks for any input.