I did a chunk of my nursing at Accident and Emergency for....to long.
Here's my 2p's worth. I treated people with knife related single stabs, multiple stabs, slashes and deep hacks. 90% of the stabbing where aimed at the body/head area. Stabbing in the back was common in patents transferred from prison hospital. The people who fought back tended to have more hand and arm injuries and less on the body. The vast majority of stabbing took place in the summer months, on weekends and at night. The people who fared best stayed calm, stayed still, applied pressure to the most severe wounds and kept mentally alert. People who it poorly freaked out and then drifted when the adrenalin rush wore off. If you're stabbed or treating someone who's stabbed the number one thing is stopping the blood loss.
If there is such a thing as a standard knife attack, victim's I have treated have said that that they where stabbed once or twice and then there where multiple slashes as they tried to run. I treated victims who had been stabbed by multiple attackers, they all tended to stab the person in the same place. I did almost two decades of nursing in that time I would say about half of all the people I treated for stab wounds where drunk.
I hope that's helpful info.
Webby.