Just read what in the N&C Part 3 coming out but told in Lulu, Johnathan and Lanie's POV.
Falby flew towards the Eiffel tower, meeting two heroes at the bottom. They introduced themselves as Rena Fox and Emo Kitty. "Who are you?" Emo Kitty asked. "Fire Bird. Call me Fire Bird." Falby replied. "Very nice to meet you." Rena Fox said. "You too, Rena Fox." Fire Bird said. Emo Kitty was ready for action. "Let's do this!" he said. Fire Bird attacked Reverser, her teammates close behind. She glared at them saying, "Are you two gonna help me or what?" "Sure." Rena Fox said. "Anything for you, my angel." Emo Kitty said. He shot a quick glare at Reverser and jumped on him. Fire Bird remembered what her kwami told her about the akumas. "The akuma's in the hover board!" she said. Rena Fox distracted him while Fire Bird used her sword to slice his hover board in half. The akuma flew out, Emo Kitty captured the it and Rena Fox restored everthing back to normal and Reverser turned back into Marc. "Bird out!" Fire Bird said. Then, she flew back home through the open window. "Shriegga, Wings Down." she said. She turned back into Falby.