B106 and P103 has Kromm mention All-Out Attack Jet "AOA (Jet)" for flamethrowers in High Tech and in this 2009 post also states

a 10-yard melee weapon that cannot parry or be parried, and that inflicts only half damage past five yards

It is unclear if this was mentioned anywhere prior.

Melee-Capable can add parrying.

GURPS Magic 73 has Flame Jet Spell say "This attack may be dodged or blocked, but not parried"

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