So, did he do the twist and pop to your neck?This is not a minimal force technique. If he use his hands or a hand tool that gently pops at the vertebra, it is a better technique for the upper cervical vertebra (C-1). The twist and pop is for the lower (C-2 and lower) vertebra.

His comments about your neck not causing PCS symptoms shows he does not understand PCS. The upper neck muscles connect to the skull just behind the ears. When the upper cervical vertebra are out of place, they can cause these muscles to spasm. This can be a major cause of head aches.