How difficult it must be for the proud Ji Fu to utter the words "I concede", especially when the opponent accepting the surrender is from an ordinary family rather than an ancient sacred ground or a sect, this exacerbates the sense of humiliation.
But he knew he had to surrender, because Ji He and Ji Zai had no way to avoid the pursuit of Wulo's Finger, especially the extraordinarily strong one, which possessed the power of transcending the mortal realm and could pierce Ji Zai's body, making rescue impossible.
If it meant the loss of a soon-to-be transcendent soldier of the Slaughter Immortal Army without achieving victory, concession then became the only choice.