[quote=@Williwaw]
Did he ever [i]specify a name?[/i] He heard it was a her kicked out of a group and that was what was explained. 
[/quote]

So he just happened to guess it was Eris who just so happened to make a call to the police. Even without a name drop, there wasn't any context for the group to know Eris was making a call. Meaning this is all based on a pretty big guess for Gary's part.