Strange behavior with 異様

新一(しんいち):

「見逃(みのが)しやすい細(こま)かな点(てん)こそ何(なに)よりも重要(じゅうよう)なんです…」

“It's precisely those subtle details that are easy to overlook that matter most of all...”

「あの時(とき)のあなたの何気(なにげ)ない仕草(しぐさ)が…」

“That casual gesture of yours back then...”

「僕(ぼく)の目(め)には異様(いよう)な行動(こうどう)として焼(や)きついてただけの事(こと)ですよ…」

“It's just that it was etched in my mind as strange behavior...”

Key Points

1. 異様(いよう)な行動(こうどう) = “behavior that felt unnaturally strange”

   • Rather that just ‘a little odd’, 異様(いよう) suggests something unnatural, eerie, or out of place in a way that stands out strongly

   • Here, 異様(いよう)な行動(こうどう) means Shin’ichi didn’t see the gesture as neutral; he recognized it as a movement that felt suspiciously abnormal in that moment

2. 焼(や)きついてた = casual past of 焼(や)きついていた

   • 焼(や)きつく literally means “to burn onto”, and in figurative use it means to be vividly etched into memory

   • 焼(や)きついてた is a casual spoken contraction of 焼(や)きついていた