Ryan Balch, a former Army infantryman who carried an AR-style rifle that night and walked the streets with Rittenhouse testified that Rosenbaum was "hyperaggressive and acting out in a violent manner," including trying to set fires and throwing rocks. Rosenbaum also angrily threatened to "f------ kill" both Balch and Rittenhouse, Balch testified.
Rosenbaum's fiancée, Kariann Swart, revealed in her own testimony that he was on medication for bipolar disorder and depression, striking a potential blow against the prosecution's argument that Rittenhouse was the aggressor in the situation.
Swart said Rosenbaum was unable to fill his prescriptions before his death because the local pharmacy was closed and boarded up during the unrest.
Rittenhouse shot and killed Anthony Huber, a 26-year-old protester seen on bystander video hitting Rittenhouse with a skateboard. Rittenhouse then wounded Gaige Grosskreutz, 27, who had a gun in his hand as he stepped toward Rittenhouse.
https://www.newsweek.com/witness-kyle-rittenhouse-trial-testifies-that-victim-was-belligerent-not-threat-1646537