Super Mario World - Climb Vine with Yoshi

Normally, you cannot climb a vine with Yoshi in Super Mario World, but with this specific glitch, you can. What I did was I started YI2 (Yoshi's Island 2) and got the P-Switch from the end of the level. I then took it through the pipe and went out and got a new P-Switch. I then picked up both of them at once and hit the Yoshi block TWICE. I then got hit and quickly grabbed the vine. The first Yoshi despawned, and the second warped to me. I was on the vine, so he warped to me on the vine, and that is how to climb with Yoshi.