original_query: What did Mahar Lagmay claim about the high death toll caused by the system?
query: What did Mahar Lagmay claim about the high death toll caused by Tropical Depression Usman?
answer: Mahar Lagmay claimed that the high death toll from Tropical Depression Usman was due to the PAGASA issuing incorrect and misleading forecasts, specifically using the "hour rainfall intensity" classification instead of the "24-hour accumulated rainfall" classification in their bulletins.