I have watched a fair amount of testimony and this hasn't come up. However, in Sept the prosecutor Binger argued that KR chased Rosenbaum with a fire extinguisher. From what I know at this point, that is a lie. https://abcnews.go.com/US/wireStory/rittenhouse-hearing-decide-evidence-allowed-trial-80071271
In particular, the article stated: "Binger said the surveillance footage shows Rittenhouse chasing Rosenbaum with a fire extinguisher before Rosenbaum turned to confront him. Binger said Rosenbaum was probably trying to push the barrel of Rittenhouse’s rifle away."
In particular, the article stated: "Binger said the surveillance footage shows Rittenhouse chasing Rosenbaum with a fire extinguisher before Rosenbaum turned to confront him. Binger said Rosenbaum was probably trying to push the barrel of Rittenhouse’s rifle away."