Whig,
Sorry I did not see your reply, my 2 were just a few minutes apart. Since the sear failed to catch the cocking piece when closing the bolt the speed that the firing pin can fall is controlled by the closing cam. On this AD I closed the bolt very slowly as we watched the bolt catch the cartridge and start pushing the round into the chamber, I did speed up towards the finish. The firing pin speed is still controlled by the opening cam. so it was still very slow compared to the normal free fall. Imagine holding the trigger as you close the bolt, the pin will move forward as controlled by the opening cam. Same speed as when opening except in the opposite direction. Surprised when I think about it that it would even ignite the primer. If you close the bolt slow enough there has to be a threshold were it is too slow to ignite.

BR,
I had already done the test to see if the safety did pull the cocking piece off the sear. It did pass. My other tests were to make sure the bolt wear/setback wear not causing any issues. Design is too robust so no issues can be created by twisting on the cocking piece, bolt or sleeve when opening the bolt even tried the same test when the bolt was fully back.
I do have a purchased firing pin with some wear on the cocking piece and can see where this could cause some issues. Will open this post up in a few minutes to attach a photo.