Just to steer things away form the personal aspects a bit - oh BOY would I like to have a good look through the autopsy report!
MH seemed - from what I've seen online at least - to have been a very fit, active, and I suspect strong young man. For him to be rendered incapable of defending himself really would take some doing. Stab wounds in the neck are more often NOT fatal than fatal, and some degree of fighting back would normally be expected. The case from Mackay in Queensland, that was on last night's news, for example, involved one man being stabbed multiple times in the neck - back and side including overlying the jugular veins - and the other man was stabbed in the abdomen hitting his liver. Both survived. The attacked was found at the beach with a rope around his neck and still holding the knife. He changed his plea yesterday to "Guilty".
My point is that it would take either some additional measures to render the victim helpless (eg drugs, concussion, spinal cord damage, etc) or else more than one person involved - one to hold the victim down while the other carried out the attack.
Now I suspect that having two people involved carries all sorts of implications, such as premeditation, planning, shared guilt, etc. Maybe a professional hit job? But the pattern of stab wounds doesn't sound like a pro job to me - a pro would simply slide the knife in under the ribs and sweep it sideways once, and pull it out. Very quick that way. The "frenzied" multiple stab wounds, most of which appear to have been carried out from behind, would therefore suggest one person, and somebody who would have had to disable the victim somehow.
The other possibility is that MH simply panicked and gave up the ghost - which would be highly unlikely I would have thought.
There is a LOT that happened that we have insufficient information on, and that autopsy report would make VERY interesting reading - at least to me!
I wonder if it will be tendered as part of the court documents once an arrest has been made, in order to get bail denied? If so, then the report may be available for purchase.