Ever been corked in the thigh? =dead leg. You absolutely can have CNS shock without actual physical damage to the cns parts.
An example : i shot a sika stag @30m with the 6.5prc 123sst @2900pfs. The projectile deflected & popped after hitting brush of some sort. Hit 3 inches in front of the pelvis, it dropped on the shot before taking off on its front legs only while i put some follow up shots into it.
The piece of bullet was only some flat shaped copper jacket that went into the backsteak but didnt damged the spine.
Now i use bonded bullets in the bush.
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