Is that true that Altgens had heard only one shot /loud noise, when he took his no.6 photo at Z-255?
If so , and IF the 1st loud shot was theoretically fired at Z195-200 ,(as proposed by Andrew Mason) , then the 2nd shot which majority of forum members here seem to agree is causing the abrupt rotation turn of JCs right shoulder at Z224 must have been a suppressed shot which Altgens did not hear.
Perhaps this might explain also the of reaction by the SS agents not occurring (seemingly) until after Z255?
Andrew keeps trying to dismiss this Z224 reaction of JC as something not caused by a bullet impacting JC , so as to preserve his version of the WC theory that only 3 loud shots were fired by a solitary MC rifleman.
The majority of the LNs and some CTs (myself included) , however , agree that the reaction of JC at Z224 is more probably due to impact of a bullet hitting JC.
Therefore I propose that an adjustment must be made to Andrews theoretical shot sequence to include the Z224 reaction of JC caused by a suppressed shot fired by 2nd gunman, which would resolve the Altgens issue.