Hey Hanzou, yes I am aware of the starting position but thanks for posting the photo again for everyone. I looked at the photo a bunch and then went out and worked the exact position on the Submission Master grappling dummy with a training knife. (a very cool gift from a student) I haven't had a chance to work it in any of my private lessons or group classes due to what we have been covering lately but fortunately I have been grappling with weapons for like forever. I have been close to this position in training before. (
minus being stretched out) In regards to going to the mount we also have to take into effect the up, over and down distance of the opponent's belly. That adds some length to going to the mount. Also if you go to the mount, you would with no resistance from your opponent just slide into it. While with resistance you could only do the knee driven method. (imagine doing the knee driven method while concentrating on the knife. (yikes) Hip switch to the mount would obviously be out of the question because of turning your back on the knife as well as totally weakening your grip while doing it. (definitely not doing that) If you meet no resistance and just slide to the mount as you are doing it your grip is going to be slightly weakened as well due to length and angle. (unless you have really long arms and or a huge size disparity) Coming up the same side by achieving right side control with an underhook with your right hand and moving up his body on the left side you should not suffer any loss of grip on the knife bearing hand.
Your grip strength and thumb angle, position of your arm, etc. is going to be very important until you stabilize it via your shin, etc.
When looking at this particular position I see a positional 1, 2, 3 order of:
1. Stay on the same side and work your way up while utilizing an underhook and eventually placing your shin on the opponents knife bearing arm and head butting and or biting him until unconscious and then taking the knife.
2. Go to knee on Stomach and while popping up to knee on stomach while also placing your left leg/shin on opponents knife bearing arm simultaneously. Then head butt, bite, etc. unconsciousness for him and taking the knife.
3. If meeting no resistance then possibly go to the mount and once achieving it both hands could have to address the knife bearing hand and you could go for the straight armbar from the video you posted. (from the munt) I would probably though be more inclined instead to place my left shin over the knife bearing arm while keeping my hand there for control as well in a modified mount. (walking the body) Then head butts, bitting, and the right arm elbow until they are unconscious and then taking the knife.
What I do not see myself doing is transitioning to the opposite side.
Could it happen, sure. Would I purposely go their as a first option no! I could also see being half guarded and having to work from there but I wouldn't choose it.
Of course everything that I do would also depend on what he was doing and that really could change everything!!! So never say never be flexible and adapt! Train with a training knife in this position, knee on stomach, guard, half guard, mount, back, crossbody/side control, etc, etc. Train against an opponent drawing a knife as well as you drawing a knife while training. Think outside the box and play with it and see what you come up with.
Kudo's to K-man for experimenting and exploring! That is what good training is all about! Do not be afraid to explore, experiment, ask questions,
fail, etc. Most importantly do not think you know it all because nobody does.
I am totally open to anybody else's ideas and or opinion's and if someone comes up with some thing really good I am there and will steal it for my training!
One thing you will definitely like Hanzou is that BJJ gives you great tools for dealing with a knife on the ground provided you explore it in training!
Just some of my thoughts on the matter based on training experience grappling with knives and beating up on that dummy the last couple of day's.