I did not that. What reflex makes a straight finger press the trigger? IMO a curled finger would want to naturally rest on the trigger, but that might just be how I work.
In Mas' words:
"Rule III should be interpreted as, “never let your finger be in the trigger guard UNLESS YOU ARE IN THE VERY ACT OF INTENTIONALLY FIRING THE WEAPON.” However, if the finger is kept straight on the front of the trigger guard, it can be held taut, setting the stage for it to snap back against the trigger with enough impact to discharge the gun if the shooter is startled. The same is also possible with the finger straight along the frame. I’ve personally come to believe that the safest position is with the trigger finger crooked, and its tip resting on the frame above the trigger area. This way, even if the hand is somehow caused to convulse and the index finger snaps into the guard, it comes across the trigger instead of straight back into it, greatly reducing the likelihood of an accidental discharge. In all my decades of shooting and teaching and researching gun matters, I’ve never found a case of an accidental discharge when the gun was held in this manner."
Again, I personally use a straight finger method, but I listen when guys like Ayoob, who have literally decades of real-life gun encounters/fights speak. Of course, obviously the straight finger method works as well, ala 4x4
If anyone is REEALLLY interested in this, you can watch this rather painful video. The only thing that makes it tolerable is that guy uses two Smiths to present his point.
[ame]http://www.youtube.com/watch?v=awbSrBZwtok[/ame]
Coming back to topic though, IDPA shooters must make sure their trigger finger is out of the trigger guard during reloads or moving/not shooting. There is no IDPA specified way to do this whether straight or curled- SOs should be happy so long as the trigger finger is clear of the guard.