Yevamos 39

In the Get Chalitza it says that she spat on the floor. Tosfos says this couldn't be the correct Girsa. The spit doesn't need to land on the floor. We see this from a Gemara in Perek Hacholetz. If the woman was taller than the Yavam and the spit was carried away by the wind before if fell to his height, you're not Yoitza. But if it did fall to his height before it was blown away, then we consider as it was spat before him and she was Yoitze her spitting. (If she was shorter, as soon as the spit comes out of her mouth is considered before the Yavam and even if the wind blows it away immediately, she's Yoitze.) Rabbi Chaim Smulowitz If you ever though that Tosfos was beyond you. Think again. A few more free copies of Gemara and Tosfos: Sukka 2a-11a is still available at https://www.tosfos.ecwid.com