Forum:Can HE really do THAT!?

hey yugi-fanatics. i need help. Recently i played a match with my friends. Apparently he used foolish burial to send his zera the mant to the graveyard. Even though it was a ritual monster he special summoned it with monster reborn. Can you really do this?

also, when you tribute summon is it possible to have it summon in defense mode...etc like labyrinth wall. thnks...much help needed