Also of note, a lot of LARPers don’t have any formal training. As Derek says, best way to figure it out is through practice.
My personal experience is that those with formal training tend to beat us untrained folk senseless although that being said, they sometimes are suprised by really unconventional things untrained fighters do.
Also, larp weapons are generally (always) completely unlike real weapons in weight and speed and typically we have rules like “no head shots” and avoid joints. I know of at least one martial arts trained player who struggles with his own training, as all of the killing strikes he has learned specifically target the head or joints (like wrists).
As far as contact levels, its really down to those involved to an extent, to find a level suitable for most people you need to get a good few people involved.
For myself, I can quite happily spar with blows just below the bruising threshold (or even past). This tends to happen with people I know well and we all know our own thresholds.
From what I have experienced, that level of contact is far in excess of what is required for LARP and light to moderate pulled blows seems to be the accepted norm.
The other benefit of lighter contact is that when someones head (or groin) appears in front of your blade (for whatever reason) and you hit them, they are less likely to be injured.
I have taken a wild swing to the head and seen stars from a boffer, while modern latex weapons tend to sting more if you get sconed a good one.
Other points to note, try to keep combatants swinging on 45’s or horizontal.
While I agree with Ryan’s comments about latex weapons and thrusting, you CAN approximate a thrust pushing forward and then tapping with the blade end with a flick of the wrist.
Its trickier and you need to aim past the body and angle in when you do it but it does the same trick.
Other points of note, encourage players to count HP correctly (if you have them) however a couple of common sense provisions make gameplay a bit more stream lined.
Firstly - if you forget if you are on 3 or 4 (or whatever) take the lower value and keep playing. If you are reduced to 0 in this manner and manage to figure out you are actually on 1 while lying there, for petes sake stay on the ground. Theres nothing more annoying than people springing back up after they have gone down. Of course, an extra blow to keep them down always goes a long way.
Second - the Mobbing rule - if you can’t count your HP because the blows are falling thick and fast, then you have been mobbed. Fall down on 0 and go from there. Theres no way you could have survived being mobbed anyways.
Combat calls - in a regular stand up fight theres no need for combat calls. If you feel the need to include some other effects make sure the calls are clear and standardised if possible.
The trend is to couch calls in rhetoric for immersive purposes otherwise clear and simple works.