Goku: uses this momentum to flip Kallen instead "You see, there are several key differences between us...one of them is that I can fly and you can't. Meaning that I can use my strength in mid-air."
Goku: finishes setting up a trap, then moves in a different direction. If Kallen can sense him, she would move to intercept rather than pursuing the direction of the trap.
Kallen stops moving. She remembers Goku telling her to sense energy so she closes her eyes and concentrates. She feels an unidentified energy moving and decides to follow that. "Better stay quiet..." Kallen continues going through the trees stealthily.