に限って にかぎって - Grammar Discussion

particularly when
those who
only when

Structure

  • Noun + に限って

限る is a 五段 (Godan) verb
Verb[て] = 限って

[Often used with expressions of time or a noun describing group of people (金持ち、XXX人etc.) along with some kind of negative situation/tendency (generalization)]

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The 日本語の森 video is not accessible, just noticing

Noticed this for another link as well, are they taking down their older videos?

みんなの日本語中級II翻訳·文法解説 has explanations and examples for this grammar point (chapter 16 10th point)