In the clip, the attacker can be heard saying: "What happened to you stabbing me? Stab me then, where's your f***ing knife then? "I'll f***ing kill you. Say sorry." The boy replies: "Please ...

It comes as a teenager was "slashed in the face" in Fife - days after he shared a video of himself wielding a kitchen knife. Article continues below In the alarming clip, shared on social media ...