Father, I was referring to the wrist proper. The area between the radius and ulna even far from the wrist would also be a possible location, and does have some contested support in the limited archaeological evidence. It also would still fall under what in scriptural language would be the “hand,” but of course you know that.
The bloodstains on the shroud (in the general wrist area), like the supposedly incorrect bodily proportions, are not something I find definitive. The bloodstains would be located according to where the wound was for most of the time while there was blood seeping out. The hands in the image are, however, assumed to be in the exact same location which could have moved slightly either during transport for burial or while in the motion of getting up, which pop science ignores for obvious reasons. This also would account for incorrect proportions, as it is simply assumed that the body must be lying flat and the image projecting onto a flat sheet. If the body is moving, which it evidently is when the hand is making the motion for an episcopal blessing, then the torso and limbs are not necessarily parallel to the sheet nor at the same distance. Hence their proportions need not be the same in projection.
All told, these things might provide information that could be used to disprove a fake shroud, and are worth investigating, but the argument for authenticity is still enticing.
And a blessed feast to everyone!