Learning how to eat shrimp

Trying to learn how to eat shell-on shrimp using only chopsticks, the way many Chinese people can.
Eva is showing me:
“So you put the shrimp in your mouth, bite off the head, then the tail, then this…”
(everything is happening inside her mouth so I cannot see the key part)
“And done! You spit out the shell.”
Still not any wiser…