This article is from the Star Trek Tech FAQ, by Joshua Bell inexorabletash@hotmail.com with numerous contributions by others.
The Enterprise dropped out of warp for a fraction of a second, and
engage the transport system. Troi reported feeling like she was inside
the wall for a moment. It appears that the matter stream falls out of
the ACB before transport is quite complete. Definitely a nasty thing
if things aren't perfect.
 
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