I simply meant that with alot of beginners, it really is natural reaction to lean/step it. It puts you closer to flame/aspiration and like Lars said, tends to make a person a bit off balance.
Frederick, the "p" sound ones are often called "puffs" because they are not as large as many others but are often done in rapid fire succession and in combination with other stunts.
I often move while aspirating, for additional effect.
Stepping back and wiping your face is purely relative to where you are and what you are doing. For example, when I drop to my knees while aspirating up, all I can do is turn my head while the air clears. Practice (non-lit) is a good way to figure out where you need to go with each variation.
A note about Lars' statement on wind.
"the fact that wind most often rapidly reverses directions 180 degrees instead of the more rare rapid change in directions of 90 degrees or some other angle."
This is actually not a fact. It is highly dependent on where you are. We are very close to the Great Lakes and Finger Lakes here and as such, the wind will shift at smaller angles rather than 180. However, in the nearby mountains, it is more likely to do a 180. But at a series of shows I did last year, the wind didn't change direction so much as kick up, swirl around and then die down. It is extremely geographically dependent and as such, there is no fail safe.
Breathe well
