qoute Canuk:
"Remember that even when griping the slide that some pistols can still fire off the chambered round. The goal should always be to move off line from the muzzle."
Yes this is always a possibility,that is why control of the limb/hand holding the weapon must be prevented from articulating toward you,the defender or your loved ones.
If we use the weapon and grab it and turn it back to the shooter,with his finger in the trigger,we WILL Get a shot fire,(if one was chambered ),so if we count on breaking the finger in the trigger well we must expect the round to go off and if when the round goes off we do have a tight grip on the slide to prevent it from going forward enough it will eject the casing and load another round.
That is why we teach that if a slide grab is made you cover the ejection port with your hand to prevent an ejection and cause a jam and no new live round to chamber.
we also roll the weapon down and under back to the shooter ,rather than as some do,just twist the weapon in an outward wide arc ,ending with a finger break and eventually pointing back to the shooter.
What happens in the wide twist is that at some point in the turn the finger puts pressure on the trigger and the round fires off,during some time in the arc the round goes off before it reaches being pointed at the shooter,so where the round went could be bad for team mates,or relatives.
Here is a clip from the Human weapon,with Moni Aizik showing the pistol disarm grabbing the slide which is simialr in most Krav Maga teaching.
Notice the wide arc with the finger in the trigger.
http://www.youtube.com/watch?v=DfOtlXs59M0Now the way we teach it:
push pistol with left hand and grab wrist (same as in clip above)
Turn body
Grab pistol slide with right hand on top
V Grip points to shooter
Hand covers ejection port
Turn pistol muzzel down towards the ground,now turn in an arc up towards the shooters,up their center line
If pistol fires it will most likely hit shooter,or the ground at angle in front of shooter,so a skip may hit shooter.
Just another way which to me is safer for all but the shooter.