Revealing mistake: When Biro stabs the Imperial soldier with his sword, it's obvious that the sword is angled to miss his body. (01:30:50)
Flash Gordon (1980)
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Directed by: Mike Hodges
Starring: Max von Sydow, Sam J. Jones, Topol, Melody Anderson
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More mistakes in Flash Gordon
Prince Vultan: GORDON'S alive.
Trivia: The tree person that gets locked into the cage with Flash (Fico by IMDB credit list), that "stole" the key to the cage, is Richard O'Brien, who is known for creating the Rocky Horror Show.
Answer: Since one meaning of "bore" has to due with digging tunnels and they are used in the torture scene, one can assume that they are worms that eat holes into your flesh.