Legal Swing (ASA OR U-Trip)

[whiskers_ump]

Hey Softball guys,

Larks here...basketball guy but softball player....quick question....

How do you guys usually judge a swing to be legal?

What I am referring to is the slow or bunt swing in softball.
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Slow pitch or fast pitch?
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Is it follow thru meaning the swing may be slow and as long as it doesnt stop, it's legal?
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Don't see why not. However, if slow pitch, and
this is a bunt movement or chop, then illegal,
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Also, do both hands have to remain on the bat?
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No
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Example, can the batter remove his top hand in order to complete the slow swing? (Letting go with top hand roughly half way thru the swing.
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Yes.

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Is this rule any different in USSSA vs. ASA?
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Should not be.