During dry fire practice with my left hand I tilt the gun inward so my dominant right eye gets a better front sight picture. For idpa and uspsa needs it really works on all my guns.
I don't know if it was my left hand fatiguing or what, but the trigger would not go all the way back sometimes if I had the gun held way over to the right.
Is this the transfer bar moving and now allowing the hammer to go back and forward. A safety measure.
Addendum: never mind. It was finger fatigue. I just shot the 625 completely flat (the gun, not me) and it went off each time. This with refreshed left trigger finger.