was a “substantial factor” or “motivating factor” in Walker’s allegedly retaliatory actions. Abrams argues that a reasonable jury could infer, as a result of this chronology, that he was “falsely arrested” and that he was arrested “because of what [he] said.” Abrams then opines that “the arrest was for an illegal purpose” and finally that “[a]nger often leads to unthinking retaliation.” After reviewing the record and the standards presented in our line of cases, we agree with the district court’s finding that this chronology is unconvincing, as it fails to present “definite, competent evidence to rebut the motion,” Michael v. St. Joseph County, 259 F.3d 842, 845 (7th Cir.2001), contains mere speculation, and demands the making of unreasonable inferences in suppo -84 (11th Cir.1998) (<HOLDING>). We recognize that such a step would not be
holding that qualified immunity applies only if an officer had arguable probable cause to arrest holding that probable cause is a complete defense to an action for false arrest holding that the existence of probable cause for an arrest is a complete defense to a first amendment retaliation claim under the doctrine of qualified immunity holding that the existence of probable cause is a complete defense to a  1983 claim alleging false arrest recognizing first amendment retaliation right