What you are describing sounds like false casting, either to stabilise the cast, let a little line out, dry a fly, change direction slightly, or just out of habit. Best kept to a minimum, and certainly no part of the fly line or leder/fly should touch the water whilst doing it.
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Around the steel no tortur'd worm shall twine,
No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook,
With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray,
And with fur-wrought fly delude the prey
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