As the healing process was ongoing Orcus review the seal on his soul again to see if he could find a loophole to escape it, he was initially haply that he made Duo agree to his term of the oath but who would have known that last minute he added a cluster in the oath, stating their life and death are tied together. In other word, he could not scheme to kill him if he wants to live, and he has to protect him too, so no harm will come to him.
"Bastard"
Leaving that to be he ran through the information left in Lucas mind, so he could get a better understanding of the situation.
