Mitsuki who was himself was now away from Team 15 and his teammates. Mitsuki was found and attacked by you, now he was giving them questions about the forest and Curse Seal. However, Mitsuki doesn't know that you were framed by Tosaka. You immobilise the birds which the birds got infected with the cursed seal by you and the birds have red eyes which means they're infected, even before getting violent. Tosaka was in league with the researchers and cursed seals operation, that's the reason why.