Xu Feng knew that sooner or later, people would learn of the existence of Flint anyway.
So rather than concealing it any further, Xu Feng decided to come clean and indulge in Flint's desire to fight alongside his teammates.
On one hand, Flint could gain more fighting experience, and on the other hand, Xu Feng could lessen the load on his command and attention of the battle.
"You can go ahead and assist Lunar Wraith over there." Xu Feng pointed at Carmen and explained, "She's one of my trusted comrades, so you must listen to her if I'm not available."
Chirping in a systematic manner, it appeared as if Flint was trying to explain to him that he had understood his intention and would oblige by it.