Just when Derek thought he'd lost her forever, Rothbart appeared behind him, laughing as he told him to stop sobbing over her. Derek was furious with Rothbart, but he knew that the man had all the power to bring Odette back to life.
Unfortunately, the bad guy never complies with what the good guy wants, right? Rothbart only ignored Derek's order, transformed into his dragon form, and instigated a fight. The prince fought with his sword, and, sure, he landed a few hits, but in the end Rothbart was too quick for him.
Derek's sword went spiraling out of his hand and broken to pieces in the dragon's teeth.
But let's not forget those friends of the princesses, huh? Remember what you and Namine always tell me? About friends?