Does Freedom of Movement overcome the movement effects of Grease (i.e. the balance checks, reflex saves, half-movement, etc.)?
Alternatively, the FAQ states that
Freedom of movement is one of those tricky spells that has
a lot of open-ended wording that might lead to confusion. The
spell becomes much more manageable if you just look at it as
something that ignores any physical impediment to movement
or actions.[emphasis added]