OK, I see why you're concerned.
That fall was adjusted in for the video -- it doesn't actually exist. It was used to illustrate a point.
HOWEVER, even with the fall, I couldn't get it to fail.
The partial trigger engagement was actually there from the factory. On several examples direct from Savage
I saw the striker drop and slamfire when set to less than five pounds of pull. The centerfire Accutrigger is awesome; they should redesign the rimfire. They are two different animals.
The other thing that prevents a negligent discharge is the sear angle. It came from the factory a bit negative(!) and I re-cut it to be slightly positive. Now, instead of wanting to slip the sear, the sear grabs the trigger and pulls it in.
My examination photos from when I was figuring out the solution to the problem:
And how it's cut to slide into the positive engagement notch:
Actually, the second (short) hook is very similar to how it came from the factory, but with the positive angle cut in.
When I took it apart to figure out why the sear seemed to be slipping, my first reaction was shock -- you cannot do the partial sear engagement thing without having a lock (such as the safety) to keep it from firing.
On this modification, firing takes place thus:
2. Cock the rifle and verify aim.
3a. For a fast shot, use the primary notch. Five pounds, not bad at all. The momentum of the trigger carries it over the secondary sear engagement so that no fly is needed in the lock.
3b. If a lighter pull is desired, put the safety on, pull the trigger, and turn the safety off. This will provide you with a lighter, more deliberate pull.
I'm trying to find a picture of the original rimfire accutrigger engagement to post back as a comparison.