No, you can't do a sign and trade. If a player is signed I believe you have to wait until June 15 to trade them. Then again, there may be a consent clause, I don't know.
Taking that post seriously. A+ effort.
Real s*** though if Demar is concussed that's obviously a massive blow. I had my concussion in a nearly identical situation to that and I still have a dent in my head and migraines from it ...
... Three years later.