Board Thread:Off Topic/@comment-30530552-20170401005801/@comment-25936766-20170423000752

Well, Pewter's Semblance just says it slows things down within it's range. If you want to be an Einstein and follow relativity, then it's (Space)Time Manipulation. If you don't want to be an Einstein, the way it was described still made it sound like it was Time Manipulation, as if it applied Slow-Mo to the victims.

"Inertia Removal", in practice, would be different, since Inertia is more or less a body's resistance to being moved (if still) or having it's movement affected (if already moving). What is moving wants to keep moving, what is still wants to remain still.