Jin Ling is both confused with the blinking and the strangeness in Wei Wuxian's behavior. Maybe, it's not really that strange, but if he's anything close to the Wei Wuxian Jin Ling knows, then he does seem a little confused.

"Th-That's because I didn't want to say something to you that I can't take back and I hate that I can't say what I want!"

Wait-- what? No! that's not it at all. What the hell is up with this layer and everything going on? Why does his mouth move on its own and say things he doesn't want to say? Whatever investigation may be happening, he's still trying to understand it all. He doesn't need this honesty to rear its head too!