I just read the article & I completely understand , the consequences of what could if involved in a knife attack or assault. Goes for everyone else too. You never know , how dangerous the situation can be. However, you are trained , be safe ,keep your distance , & not initiate anything unless ,you have to to protect yourself. If other people are with you , such as family ,run away , get them & yourself to a safe place with out being harmed. Phone 911. It's vital & Sam I agree that everyone should be trained , educated to know what a knife attack can implement , such as life threatening situations. Thank you , brother.