He's encouraged enough by Kellen seeming interested in the first part, but slowly the attention seems to scrutinize as he continues. Finally, when he starts to re-string his shoe, he offers a half-apology of, "Don't think I'm explaining it right..." Because that must be the reason. Because Kellen isn't unintelligent, Kyle is just weird, and now he has fucked up science in his eagerness.

He wraps his arm around his knees when he's done, ankle still just barely touching the other boy's, but looking a little defeated now as he watches the cork fight the abuse, "It's... it applies to time travel, really. Not life." He offers weakly, but he should probably just stop and enjoy this, without spewing facts.