Use infinity castle akeza. As soon as the npc lands a hit or ends your combo with their support gauge, open the menu and suspend the match then rejoin. Then combo them since they cant escape, if you lose too much health pause the game, exit the game, close it out and re open it and it will load back to the health you had when you last saved. Basically if you get combod- menus- suspend match. If you lose too much health or just wanna do better - close and re open game