Mesmetron is from the optional quest to get into Paradise Falls, no the device I'm talking about lets Deathclaw with the mind control helmets work for you. and the Deathclaw underground thing is another famous Deathclaw glitch. also happens with wild dogs and radscorpions. The glitch I mentioned launches DC's so high VATS can't reach them. This has been confirmed at Old Olney, The DC lair, and the Memorial park where the schematics for the DC gauntlet is.