Use of に in a list of names?


In this funny scene from the anime Kiniro Mosaic
(<https://www.youtube.com/watch?v=uIauXFVABIQ>), the character Karen is
listing peoples' names to get familiar with them and says, "陽子、忍に、えっと…"

What is the reasoning behind the に after Shinobu's name? Wouldn't と make more
sense? Karen is British, so did they insert that just to make her sound less
fluent in Japanese?

