Rene said the most useful technique he learned at the studio is grappling , which is a technique to control a person on the floor .
The first thing on any drug dealer 's mind is to grab the officer 's weapon .
Rene said the most useful technique he learned at the studio is grappling , which is a technique to control a person on the floor , because the first thing on any drug dealer 's mind is to grab the officer 's weapon .