Here's some reporting from the actual criminal trial with comments from the judge on some of the questions you've asked.
Judge William Mousley KC says Henry Nowak "perhaps cheekily" had made a comment to Vickrum Digwa, asking him "if you were a bad man".
"He was filming you on his phone when he spoke. The tone of his voice was not aggressive or threatening."
But Mousley says this turned out to be a "tragic error of judgement".
"You moved towards him and confidently told him that you were a bad man," he adds.
"You drew the dagger from its sheath...and deliberately stabbed Henry with it. It passed upwards through soft tissue between the two uppermost ribs, catching a lung and cutting an important vein behind the collarbone."
Judge William Mousley KC
The judge says the pathologist explained how no emergency medical treatment would have permitted access to the bleeding vein: "In simple terms, he would not have survived, however quickly he received first aid, CPR or medical treatment."
