Bolt's 9.58 in Slow Motion

so using the cue “knee through” one would be concentrating on essentially high knees? i do notice that during powells tranistion it looks some what like he is “prancing” and i could definitely see how cueing knee lift would cause this, just it still would seem strange to me that whereas at top speed and accel the cues are on pushing down/back, during transition it would be a knee cue…