I didn't notice the fly when watching the debate, but I didn't have my glasses on, also I was busy scrolling here kek. But are we sure it wasn't media trickery again. Member when they got caught adding and removing a pimple or something to the face of Tulsi Gabbard during a debate?
https://www.tmz.com/2019/06/27/tulsi-gabbard-disappearing-zit-blemish-debates/