While usually Ryuutaro would immediately question being ordered around like that and not obey without half-an-hour of discussion, he had come to trust Hayato when it came to their safety and learned to obey such orders immediately and without any sort question at all.

He looked at the man in the doorway though, as unsuspiciously as he could. He knew he reminded him of somebody, but the thought seemed to ridiculous and unlikely, he didn't bother finishing it. He could ask Hayato about this later.

And then the man talks and while Ryuutaro could not understand a single word he felt that he knew Hayato.
And then Hayato's reply...
Now Ryuutaro had to take another wary closer look at the man's face.
No, it was just silly, why would---?
But he knew about fate and its odd ways better than anybody else.
It seemed to match and the tension Hayato was radiating...

Ryuutaro would say nothing now, but he felt himself getting really nervous as well.