The flip flop evidence takes place at around the 2:51 minute mark.
This is your typical Indonesian traffic accident video – filmed on an awful quality cell phone camera. The victim wore a helmet, but it didn’t save his life. I think he may have broken his neck. There is blood underneath his head, but it’s unclear as to where it’s coming from.
You may want to skip to 1:12 which is when the removal of the dead motorcyclist from the road begins. Nothing much happens before that.