Just witnessed a rider high-side as he was pulling away from a traffic light. It looked like he was in a little bit of pain but was okay to ride away. Go easy on the throttle, especially when changing lanes. I think he spun out when he went over a merge arrow painting. The painted lines and surface is extremely slippery when wet.
Luckily, we were right behind him so we were able to block the traffic while helping him get back up.