The Vampire hunters armed with the flamethrowers appear in Legacy of Kain: Soul Reaver within the City and the Silenced Cathedral.
Notes
While Raziel can´t be harmed by fire in bonfires in the game, he is damaged by the flamethrowers if the human fraction turns hostile towards him.
Flamethrowers could only be armed in the Early Beta version of the game and it is not possible to fire them in the same manner as human enemies can.
References
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