I don't see a problem with re-using it.
Going from a high gravity to low gravity will stress the yeast, but from high to high I have never noticed a problem, but use a blow off tube if you just rack onto the yeast cake.
Personally I would wash the yeast.
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In Primary: Belgium Chimay clones.
In Secondary: Braggot, pale ale, end of the world white.
Conditioning: Mead, Cider, braggot, Belgium Wheat.
On Tap: Clones, Chimay Blue, Red, Porter, malted cider.
Bottles: Far, far, too many to list.
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