It looked like he was going to sleep as he tapped, so then even though the choke was let go it still takes a few more seconds to get oxygen to the brain, so he had to reboot so to speak.
Theres a lot of examples of this with any blood choke, the guy who got Ezekiel choked recently was conscious yet sat there in a stupor for a good 20 seconds waiting for his brain to get back to normal.