The hajiki technique is basically a pull-off. You can make an audible, snappy tone by pulling the string to the side until it slips out of your finger, causing it to sound.
But why verbally explain it? Let’s just watch this technique in action!
As you can see in the video, to sound P.3 with hajiki, you must put the index finger on P.3 and then pull the string with the ring finger.
When sounding P.3, the ring finger usually pulls the string around P.4. That doesn’t really matter though, as we technically shouldn’t be able to hear P.4 anyway. Ideally, we should only hear P.3, or wherever our index finger is pressing.