Wang Tong had already registered that his opponent's intention was in dragging on the game for as long as possible. After a few rounds of the game of cat and mouse, Flash's unit's life bar had drained to almost zero while Wang Tong's were still nearly full.
However, since Flash had lured Wang Tong's unit closer to his base, Flash was able to reinforce the first unit with another one fresh out of the star-port.
The critical element in successfully pulling off the Art of the Soaring Heaven was to destroy the ground radar early on, and to do that, one needed first to establish dominance in the air.