Tinuviel looked between the two paths as Aika and Fumi discussed directions.  He didn't want to laugh over Fumi not remembering, but as she herself laughed about it, he joined with a small chuckle.  Yeah, it made sense that Fumi normally let others lead the way, 

"You should keep trying," he said, "the only way to improve is through practice and training, after all."  At least, that's what his parents told him when he talked about his trouble working alone.  Fumi then asked which between him and Aika should lead the mission, to which Aika explained that leadership was normally her responsibility when the rest of their team was busy with other things.

"If that's the way you normally do things, then it's probably better if Aika leads," Tinuviel said, touching a wingtip to his chin.  "She knows the way the two of you work best, so it'll be easier for her than me."  He grinned back at Fumi, "Yeah, that sounds fine."