Using laso select to paint mask in sculpt mode?

Hello all. I was watching some sculpting videos to get an idea of work flow and what addons people are using to complete their projects. I ran into a video where a user was using what appeared to be a lasso select option to paint a mask on object to isolate area. I am familiar with mask tool while in sculpt mode, just not sure how lasso was used to paint mask on object. I tried replicating by holding down Ctrl + RMB to use lasso and nothing happens. Could this be a script that artist is using to allow them to lasso select paint mask? If not what is the button sequence or option to enable it? I thought it was interesting and I am curious to know.