It is already impressive that he can threaten the lives of enemies with level 2 Dao Statuses who are supposed to be as strong as him with only the power of his Life Ability. So, he shouldnt beat himself up that this isn't enough to kill all of their enemies.
Of course, things would be very different once he decides to fight them with the combined power of his body, his Life Ability, the Sword Heart Metac, and the Reversal Metac. But he didn't need to do all of that to kill the enemies he had his eyes on.
He stayed in relative safety while sniping at their eyes or lungs or hearts. The only urgency that he felt was from the possibility that he wouldn't have enough to kill.
This was a true possibility because it quickly became obvious that they had outnumbered their hands. This became the case because they had two beast masters among them who released all of their beasts at once.
