I'm struggling to see the usefulness of this technology. If an attacker is within 10 meters, it is simply too late. The average human can cover 10 meters (~30 f

I'm struggling to see the usefulness of this technology. If an attacker is within 10 meters, it is simply too late. The average human can cover 10 meters (~30 ft) in 5 seconds or less. Not to mention, detonation of a well designed explosive at 10 meters is still going to severely injure or kill a lot of people.