WASP knife

This knife has a CO2 cartridge in the handle, and blasts whatever you stab it into with carbon dioxide. The idea is that if you are attacked by a bear or shark, you can stab it and it will inflate and explode their organs. I posted this professional video because
1)the guy's wearing a scuba outfit in his backyard
2)the picked the worst angle to show off this feature
3)the table is made of stumps
4)they spent all that time on stenciling WaSP onto the back of the table, and the rest of the table is made of stumps.

The knife is $400. Apparently the british police are convinced would be knife killers are going to use it on their victims. All they have to do is look for the scuba diver covered in spattered blood and watermelon with a pocket full of empty CO2 cartridges.