The Vortex Hopwire (also known as Black Hole Grenade) is an unfinished and highly unstable weapon cut from Half-Life 2: Episode One. Its proper name is unknown, as the HUD only gives "#HL2_Hopwire". It is also unknown how it was originally to fit into the storyline, although it was probably to be used against Striders (being an equivalent of their warp cannon, only more powerful), as suggested by the console codes "hopwire_strider_hits" and "hopwire_strider_kill_dist".