Where inmate failed to show causal link between his filing of grievances and shakedown search of his cell, First Amendment retaliation claim failed.The 7th U.S. Circuit Court of Appeals affirmed a decision by Judge Staci M. Yandle, Southern District of Illinois.Illinois inmate Elijah Manuel assisted his disabled cellmate. The cellmate requested a change of rooms and became hostile towards Manuel. Manuel reported this but no action was taken. Soon thereafter, the cellmate beat Manuel into unconsciousness with his wheelchair …