Jet

The attack emits a jet of energy that suffuses the target and extends to strike a second creature. This secondary target must be adjacent to the original target and on the opposite border or opposite corner of the target’s space from you. When in doubt about whether a second creature’s position compared to a target makes it subject to a jet attack, trace a line from the center of your space to the center of the second creature’s space. If the line passes through opposite borders or corners of the primary target’s space, then the second creature is a valid target for the jet attack. If multiple valid targets of the jet damage are present, you choose which is the secondary target. Roll the amount of damage listed in the weapon’s jet: the secondary target takes this damage (not multiplied by the critical hit) of whatever energy damage type the weapon deals.

Source

Armory pg. 31

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