So, you're outside, walking along at a public park...it's an early Sunday morning and no on is around except for one person who is approaching you. This person stiff shoulders you as they walk by and says, "Get outta my way you f*** n***!" You respond with an, "Excuse me!" and the person turns around punches you, then a scuffle ensues. Fortunately, a police officer hears the altercation quickly intervenes.
When asked, "Okay, what happened?" You're telling me you won't mention the racial slur because there was no one around to corroborate it?
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As for her, of course honesty by both parties is best, but do you really think she'll "fess up" if no one heard anything one way or another? It completely benefits him to speak up and has the opposite affect for her (would you agree?)