This Skill can be used whilst a player is Prone. A Prone player with this Skill can stand up for free without hvaing to spend 3 squares of movement to do so.
Additionally, a Prone player with this Skill can declare a Block Action whilst Prone. If they do, they must make an Agility Test, applying +1 modifier to the result. If the Agility Test is passed, the may immediately stand up and perform the Block Action. If the Agility Test is failed, then the player remains Prone and their activation immediately ends.