onlooker, watcher, spectator, witness; see observer 1.
"bystander." YourDictionary, n.d. Web. 12 October 2018. <http://thesaurus.yourdictionary.com/bystander>.
bystander. (n.d.). Retrieved October 12th, 2018, from http://thesaurus.yourdictionary.com/bystander
Someone who observes:
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