Zbrush Taper problem

PolycountCounter

I'm trying to taper this lower half of a cylinder, and I'm getting this:


When I'm supposed to get this:



Can someone tell me what I'm doing wrong? 
Here's the video tutorial I'm following:
https://www.youtube.com/watch?v=19wQK2gAE44&t=131s

cryrid

The behavior might have changed between that video and the latest version of Zbrush. If you're on 4R8, try changing the Taper's axis to just "Y" (the opposite of the video, which has X and Z on).