I would do this: separate the sass|scss and css files into different directories and use sass --watch only in the sass folder. The output should be redirected to the css folder.
Assuming your application structure is similar to:
app | |--assets |----| |----|--test.sass |----|--print.sass |----|--ie.css
Change the structure to:
app/ | |--assets/ |----|---sass/ |----|----|--test.sass |----|----|--print.sass |----|---stylesheets/ |----|----|--ie.css
and run
sass --watch assets/sass:assets/stylesheets
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