I think lobomotimser should take away the skill, isn't it active(like momentum)?
Well, Mutation gives the passive skill "mutant", and can also leave skills like "airborne" behind. On the other hand, Adrenaline and Gravity Pull both give status effects, so that could be what happens in this case as well.
In other words, passive (like mutation), or status (like adrenaline). Momentum gives the skill "momentum", but doesn't overwrite any previous skills, and can be lobotomized, unlike Adren and Grav pull (the status, not the ability)