While Saturday’s unrest drew hordes of demonstrators to downtown Salt Lake City and spurred innumerable staredowns and physical clashes between police and protesters, two altercations grabbed much of the attention Sunday. The first: A man who drove his vehicle into the crowd and pulled out a bow and arrow, which he allegedly aimed at protesters. The second: A police officer, decked out in riot gear, who knocked over an elderly man with a cane while he was standing on a sidewalk by the Main Library. Both were captured on video. The Salt Lake City Police Department is investigating both confrontations. When officers saw the man with the bow being assaulted, Chief Mike Brown said in a video message Sunday afternoon, their first thought was for his safety. So they pulled him out of the crowd, offered aid and ascertained his identity. Protesters flipped over the man’s car, which caught on fire and burned. In a posted video, the man, identified as Brandon McCormick, responded to a st