It hit L like a ton of bricks. "Ah... Spanish... Cielo... sky." he said quietly. "I understand. It makes sense, now." he wanted to inquire if the young man was Spanish, but somehow, it seemed counter-intuitive. Since he was likely from a completely alternate reality to L's own, it probably wouldn't be particularly productive to reference other countries in the world L knew.
"I think we're in the clear," L said quietly, the sound having faded away. "What do you think? Is it too presumptuous to assume that we are safe, or...?" he had to be careful, he realized. He had to interact with Cielo as a person and not as a case study.