Of course the shot was misplaced bearklr, that was never in contention. No I never expected the bullet to explode and damage the spine, but I would have expected the bullet to expand enough to at least give a couple inch across exit hole, after 12" of solid sinewy meat, and maybe take him off his feet and disorient him for a minute or two, or even a few seconds. Had the TTSX done this I would say it had done it's job admirably. You seem fixated on the fact it was a less than perfect shot and not the bullet performance, if the bullet had, as you say exploded and killed the deer stone dead but failed to exit or even penetrate 6", I would still be on here reporting a different kind of bullet failure. Whether or not the animal dies on the spot or later is somewhat irrelevant to bullet performance. A bullet that explodes within 4-6" of the entrance wound is a failure regardless of where it strikes an animal and likewise a bullet that zips through imparting minimal damage and shock to that animal is also a failure, REGARDLESS OF WHERE IT STRIKES THAT ANIMAL.
And just for the record, I have shot several medium sized animals in the ass and have taken out a lung or lungs, with a 35 cal 225 gn AB, a 30 cal Partition of either 180 or 200 gn, and a goat with a 250 Part from the 340, but no real surprize there, is there. Likewise I have shot a good many animals looking straight on to me and found the bullet under the hide in the ass somewhere, just started out from the right end instead, but still the same performance................