Forum:Heraklinos question!!

hey i saw this situation on a tournament today,my opponent has a facedown trap card, and a heraklinos with two cards in his hand , and i activate MST then he activates heraklinos effect and discards a card ...... then i activate book of moon and a few people said that heraklinos cant negato in chain??? cause he aint multi trigger.... is that true???? the said the same with royal opression ... that royal opression cant negate in chain!! please help me! :P