A bystander is someone who is present but not directly involved in a particular situation or event. They observe what is happening but do not take part or interfere. Full definition
Here, there's only one victim (for the most part, although the number of innocent bystanders who fall changes depending on the specifics of the protagonist's actions). (markreviewsmovies.com)
The 2008 Mumbai attacks, which saw hundreds of people killed and injured when ten gunmen infiltrated the city by boat and targeted high concentrations of bystanders in hotels, railway stations and public places, have heightened alert levels in security forces across the world. (politics.co.uk)
There's no excuse for involving innocent bystanders in your bullshit squabble. (sbnation.com)