If I may comment on a few points about training and the perception of Reality.
To me,if we train to fight and train to spar as a regular event,without aspects of SURPRRISE then we are training,we may be close to Reality in the effort put into controlled contact,but we have not activated the Mind to jump to a low level,(yet level of fight or flight),we have not CAUSED the Need for the mind to quickly recognize and ACT in Realtion to attack.
I am not speaking here of a conflict which happens due to people bumping into each other in a bar and going verbal,with body posturing which escaltes into the need for conflict,and which takes time to build up and Slowly raise the aprehension of actual contact,before it actually kicks off.
I am speaking of Generating a level of fear ,in a training environment,which is a surprise and which will get the Heart rate to jump up from the immediate call to action,over the joke of raising the heart rate through exercise to simulate the Heart rate due to surpise.
(that is sadly not the same)
There are ways to cause this Jump through surprise of attack in training,who cares if the mind knows going in that there will be training ,or if the mind knows after the fact that it was training,the goal is to get the mind and the student /trainee to recognize an attack and respond in a FAST ,Immediate reply.
I have talked of having new students being grabbed and threatened verbally while being pushed and pulled and being told to act.
This gets the surprise
This gets the Heart rate up
It works because it is unexpected
They are not told this may happen in a minute and then do it
It is done as they are on a break,just before class,in the middle of demonstrating a movement where they are rushed ,pinned to the wall and forced to act by doing something.
This can be done by a group told to attack at a certain point known to them but not the victim.
It can be done with a bag in a box type drill
Where the victim is in the middle
A bag over their head with attackers positioned around them
Bag is pulled off and they must respond and act to the immediate threat or threats. around them by dealing with close to far threats.
These are just a few ways to cause the need for immediate action through the use of surprise and fear.
The goal is to get them to not freeze,to not worry about what they do but to act Immmediately and do something.
Whether they go preemptive and strike at the recognition of threat of voiolence or whether they respond to a physical strike.
Get them to ACT,to flip the switch to action and go with controlled yet extreme violence of action to terminate the attack and get out.
Surprise needs to be on a regular basis,to allow the student to get used to and function in this surprise ,immediate need,role.
The more exposure to surprise threat,the more it BECOMES REGULAR training.
This the Reality of training which can and should be being done.
This is not accomplished by dictated ,known to the victim and attackers,type work,where attacker A will attack the victim in ths manner and or attacker B will jump in on a two count and attack in this manner and victim will do this technique to A and this to attacker B.
This is OK on a certain level,hypothetical scenarios which cause a set reaction but the victim will in all likely hood NEVER see that set up of attack outside class,just like traditional Karate or TKD set ups of if they do this you do that.
Attacker steps in and punches,we high block ,reverse punch and front kick.
Creates movement and application coordination but is unrealistic.
Principles Based training
Principles give us tools,but DO NOT Dictate SPECIFIC Applications.
Actions should be spontaneous, instantaneous, replies to immediate evolving circumstances not dictate Rote Responses that an attack,will happen with this and the follow up will be this and the next follow up will be this.
All we know in a Real attack is what we will do First ,our first move in this living game of chess.
Second, third movements/strikes,techniques ,and if needed more responses, only become known/doable from the response or input of the attacker/s.
my opinion
Sorry for the length I get carried away with this stuff a bit,lol.