Even if Phantom reached K3-Level, it did not guarantee that he would be able to fly. Special abilities were required for that. Monsters had an advantage in this regard, as they could have wings like the Kirani Guards.
However, at the K4 Level, everything gradually changed. Adam was just learning this new ability, which at first did not seem very useful to him. Initially, he thought that its usefulness was limited to slowing down his fall when jumping out of a fighter jet.
Now, it became clear to him that against flying enemies, controlling energy in this way made life much easier.
All he did was condense energy in the air to push himself half a meter to the side. But that was enough for a powerful lance to fly past him.
For the Second Rank Phantoms, this was no problem. They did it as naturally as they breathed.
Adam needed practice to achieve their mastery, and there was nothing better than combat for that.