In order to get into trapping range, students are taught two methods. One method is a hand flick to the eye or a snap kick to the groin. Each is a quick and unexpected move that causes pain and distraction, and is immediately followed-up with the "straight-blast."
The "straight-blast" was considered by Bruce Lee as the pivotal maneuver in his street fighting strategy. It is the rapid succession of punches placed down the center line (face area0 of a person while simultaneously applying pressure by moving abruptly toward your opponent. This technique drives the suspect backwards rendering him off balance, confused, and in a defensive posture. This advancement allows you to get into the trapping range, where you can grasp the back of a suspect's neck and utilize a combination of knees, elbows, and headbutts.
The second method is used when the opponent displays some skill in fighting and may already have his hands up offensively or is attempting to punch or kick you. By positioning an elbow or knee in the path of an incoming strike you are able to cause immense pain to the subject's leg or fist. This facilitates a transition into trapping range and the application of knees, elbows, and headbutts. Such use of your elbows and knees is referred to as a "destruction" tactic and is often associated with the Filipino Martial Art of Kali.
Despite one's best intentions, sometimes fights go to the ground. The Rapid Assault Tactics program teaches officers basic Brazilian Jiu-Jitsu moves in combination with the use of knees, elbows, and headbutts (K/E/H). Again, the goal is to get to a stand-up position, where the best hand-to-hand combat techniques (K/E/H) can be utilized, and where you can defend against multiple attackers. Most officers have neither the time nor desire to become a skilled grappler, however by learning basic groundfighting moves, coupled with the little known art of Kina Mutai (eye gouging and biting), officers now have the ability to survive violent ground engagements.
This specific martial arts technique, when done properly, can be devastating to an opponent. Remember these are street fights, and the difference between life and death for an officer can hedge on his knowledge and ability to end a confrontation quickly before becoming injured, rendered defenseless, and or killed.