So naturally like this Alan was fighting all the Monsters in the core area. Naturally he did not want to level up but still we could see most likely while fighting the boss he needed to do that. He already came very deep inside of the code area and at that place he could already so Monsters that most likely already reach the Level 49 or 48.
Naturally fighting those monsters wasn't easy for him but as you can tell all this time he wasn't using his bloodline power to fight those monsters so naturally that fight became harder for him. But he still did not decide to use the bloodline power because he already decided only to fight the boss. He will use that and other than that he will not try to use that.