This article is from the The Terminator FAQ, by Karsten A. Loepelmann kloepel@connect.ab.ca with numerous contributions by others.
It is possible that the T-1000 made itself thin enough to avoid being
noticed.
The T-1000 doesn't necessarily need to keep a consistent thickness while it
is
on the floor (i.e., it's not a "slab").
 
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