BUT... Walt is saying that the unfired round just dropped out (through gravity) as Fritz handled the rifle - but that would have been impossible with the bolt arm being in the position it was in the Aylea film! If Fritz fully retracted the bolt, then the round could simply fall out.
Walt apparently thinks that the extractor was behind the rim of the cartridge and he apparently believes that this is the reason that the bolt (apparently?) wasn’t fully forward. If this were true then Fritz could fully retract the bolt and I believe that friction would still hold the cartridge in place in the barrel.
However, if Walt is not correct and the extractor was engaged with the cartridge properly, then Fritz could fully retract the bolt gently and the bullet would fall gently to his feet. Walt apparently believes that the ejector would throw the cartridge across the room. But when a very light force is used this is simply not true. Here is testimony to back this up:
Mr. FRAZIER. …Now, this circle will not necessarily encompass all cartridge cases ejected from the rifle, since the ejection is determined, not only by the angle of the weapon, but more by the force with which the bolt is operated.
A very light force on the bolt can cause the cartridge case to tip gently out and fall at your feet. However, under normal conditions of reloading in a fairly rapid manner, we found the cartridge cases to land in this circle.
So, it appears to me that the more likely scenario is that the cartridge was properly engaged by the extractor and that Fritz used a very light force to fully retract the bolt.