Same rule as with the .25...do you want to be cut with one? Palpate the carotid artery in your neck. How far down does that major artery feel? Guess what happens if it gets nicked?
There are a number of major arteries that are accessible with this blade. If you don't know where they are, you should. There are also a number of tendons which can be severed with this blade.
Actually I'd be concerned if confronted with this blade. I'd be concerned that the wielder knew exactly where those vulnerable arteries and tendons were located and how best to access them with that teeny weensy blade.
Back in the 1950's a relative was defeated in a beer joint close to here. When he said uncle, the other guy kept kicking him around the floor. My relative took out his pocket knife. Small pocketknife and the blade he managed to open was the smallest. Little more than an inch long. He caught the guy by the leg as he got kicked. Guy dragged him back to the other leg which he also grabbed. Then he started cutting the guy behind the legs just above the knee. That guy has never walked since that day.
Beware the guy with the little blade. He probably knows how to use it.