Bystanders may witness events without taking part, often providing useful information. As a bystander, she could recount the accident details to police.
Pro Tip 2/3
Non-Participant
Being a bystander means you're there but not engaging in the main event. He stood as a bystander at the rally, watching without waving any banners.
Pro Tip 3/3
Emergency Situations
In emergencies, bystanders can be critical by calling for help or providing aid. The bystander quickly called an ambulance after witnessing the collapse.