At the World Jiu-Jitsu Expo Seminar, Master Renzo Gracie showed one of his specialties: Toe Hold from half guard against the knee shield. Notice how important it is the block the lower leg.

The Most Comprehensive Course On Triangles Ever Created – By The Greatest Grappling Coach On Earth.
John Danaher Calls The Triangle The Most Versatile Submission There Is & In Triangles: Enter The System He Shows All Of the Setups, Chokes, And Armlocks That Will Make This Become Your Go To Move From Bottom Or Top.