Meitantei Conan S2014E32 - The Tragedy of the Red Woman (Evil Spirit)

Yui Uehara of the Nagano police arrives and learns of the murder case and details, such as the fact that no blood traces where found in the bathroom. As the other guests are in distraught over Masaie's death, their whereabouts are told to the detective. Why were tomatoes floating in the bathtub?