The device from broken steel? Is that the Mesmetron? I can't remember that mission =\

Anyways. Probably because DeathClaws are glitchy. In old Olney I saw one stuck in the ground. But it still moved and attacked. I have a video, but it is sucky quality. I shoot my Fallout 3 videos with my phone. Its fast and easy, like your mom. Video: YouTube - Deathclaw in the ground.