Used my Otan on Friday to deflate the tires on a Malibu that got bananaed after it pulled out in front of & got T-boned by a big work van. This was done to stabilize the wreck before my fellow firefighters begin to disassemble the car to get to the entrapped driver.
I learned that the most effective way of knifing a tire is to insert the blade into the tires' sidewall perpendicular to the tires' radius. Nearly explosive and rapid deflation follows. Inserting the blade into the sidewall parallel to the radius does result in a leak, but not rapid deflation.
I was surprised at what little effort it took to insert the blade all the way to the handle.
Not a mark on the blade afterwards, either.