What action should be taken to strike the top of the forearm?

Striking with an empty hand to the top of the forearm is effective for several reasons. This technique utilizes the body's natural capabilities and allows for quick responses in a defensive situation. An empty-handed strike can be directed precisely and executed with the necessary control, which is crucial when applying defensive tactics. It minimizes the risk of injury to both the responder and the subject while still delivering an impactful strike that can temporarily incapacitate or distract an opponent.

Using a blunt object may result in excessive force or unintended consequences, such as severe injury, which can be inappropriate in many situations requiring restraint or control. Similarly, striking with a knee may not offer the precision needed for targeting the forearm and could lead to a more aggressive encounter, which is generally not advisable unless absolutely necessary. Lastly, a foot strike is typically more suited for targeting larger areas of the body or creating distance rather than focusing on a specific, smaller target like the top of the forearm.