Sun Yang's three-breaths and three-strokes off the wall after a flip-turn is vary hard to do

 I tried it during warm-up and when I was fatigued during a set of 150's. I found that after taking the first breath off the wall I could not exhale fast to get a strong second or third breath. I have no idea how he is able to oxygenate and expunged his CO2 in time to make a three breath grab?