by the hammer. When it goes back to Mario, the vine will go up. It is caused by Luigi going up the vine to trigger the glitch. If you go up all the way, there is an animation of the vine going uo. By dying, the game does not know what to do with the vine so it appears on 1-2 to trigger the animation. It is tricky to do, but possible, also look on Youtube if you are still confused, enjoy trying it!