Bend the upper part of his body (from the waist) forward at 45
degrees, and hit his back hard enough to force the fishball out of
the throat. Another way would be to hold the victim's legs and make
him do something like a 'handstand'. Then, hit his back hard to
force it out. You can also hit his chest (not very hard) to create
a kind of feeling that makes him want to vomit (seems like a bit of
breathing problems). The fishball will also come out. If the
fishball is deeper into the throat, toggle the uvula to make him
vomit.