Alyx had Dog use the 'ball' to play catch with Gordon Freeman, so he could get some practice using the Gravity Gun. If Rollermines are caught in an explosion, they bounce up and detonate.Īlyx was at one point able to capture and disarm a Rollermine, which she then gave to her 'pet dog' to play with, calling it a ball. Additionally, one can elude Rollermines by outrunning them, as they cease chasing once a target is too far away. Complete submersion in water also causes them to short-circuit and explode. Rollermines can be destroyed with explosive devices, or alternatively may be picked up with the Gravity Gun and launched out of the way (or at enemies). They are also deployed in buildings and structures, taking any intruder by surprise.

Attached mines cannot be removed except through excessive force, chiefly the Gravity Gun touching them will merely cause electrocution. For this reason, Rollermines are usually deployed in tandem with Combine soldiers, who ambush the stranded individuals. Besides the damage inflicted by any resulting car wreck, attached Rollermines do not directly injure the occupants of a vehicle. The mines can magnetically cling to a target vehicle (such as the Buggy) and interfere with the steering, forcing the driver to either stop or drive off the road. When an enemy target is detected, the Rollermine will pop out of hiding and roll towards it in a relatively straight line. Upon landing, the mines will remain inert or, if they land on softer terrain like soil or gravel, they will burrow themselves into the ground, remaining almost invisible. Extensively used along the coastal roads, they are deployed from the air by Combine Dropships, in groups of two to four. A reprogrammed Rollermine exchanges jolts with an unaltered one in the Citadel.Īs the name implies, Rollermines roll towards enemies and electrocute them via close-range electric shocks.

Half life 2 dog