Starting Jelq - Vasectomized

Hello, I have a doubt, I started my Jelq, before I used to do my Jelq doing a different way as show here on the site.

I used to hold the base doing a circle with my fingers, with one hand, and with the other hand, I used to hold my Penis and do the jelq.

So yesterday I changed to use swapping hands just like show the video of this site, doing wet jelq, using basically only one hand. But this made the side base of my penis hurt a little bit, now I feel some pain. Looks my vasectomy in painful inside, strange. That happened with someone here?