Kh fall or redeem

In land of departure you see if Ventus returning home confronted by Eraqus about the X-blade and and how he is to make it realizing that Xehanort used him for his plan, Eraqus feels that he is left with no choice but to kill Ventus-but what you should if you had choice to stop eraqus from murdering ventus in cold-blood or wait terra and let the timeline or as for normal in this scenario or there's a third option reasoning with Eraqus try talk to come to his scene realizing on what he's about to commit knowing that he can't take it back for granted and grave mistake on try to take someone's life but more on that what will Aqua and Terra say to their master if they say Eraqus taking a person's life away.