I've chosen to advance, and selected the grenades to make an attack. My target is 3 spaces away just behind a demon that is nose to nose with my poor marine. The invade player plays a Jammed card before I roll my attack, forcing me to select another weapon.
Does my attack automatically fail then? I don't have any other weapons with seeking and the space I picked is out of line of sight, so the Invader player ruled that the attack failed, is this correct?
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