There is a very clear set rule that tandems can not perform a turn greater than 90* under 500ft in the BSRs, from view of the landing area during the male students landing compared to this landing, there should not have been any obstacle or lack of landing area to require such a hard turn, and even in an avoidance, 30-45* is almost always enough. While I understand your point about answers being found here, I have to disagree with the possibility of this being a simple mistake.