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The Fast Headcrab attacks in much the same way as a normal Headcrab, and does about the same amount of damage. Fast Headcrabs are not officially seen again until Ravenholm. Fast Headcrabs are later seen being cooked in the All-Knowing Vortigaunt's cave near the dam before Black Mesa East. When going back to Arlene after leaving with the Airboat, she appears to have been killed by the only Fast Headcrab of the area, although it did not turn her into a Fast Zombie. The Fast Headcrab is first seen at Station 6 in the beginning of the Half-Life 2 chapter Water Hazard. Fast Headcrabs have been seen being cooked by Vortigaunts, apparently as food. They drop off when the player gets too close or shines their flash-light on them. This is seen in Half-Life 2: Episode One, Lowlife. The legs of a Fast Headcrab also have elongated claws, which serve as weapons as well as a means to latch on to surfaces, where they then wait to attack unsuspecting prey. Examined up close, Fast Headcrabs have wart-like bumps on their skin.
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Fast Headcrabs share many of the vocalizations of the standard Headcrab. The Fast Headcrab looks much slimmer and more agile than a normal Headcrab, having thinner, spindly legs, smoother, lighter bodies, and no visible mouth-parts.
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