Originally posted by h1a8
Actually he can manipulate the past.
This is why Voidt use tachyon field to prevent DM from doing that.
DM also changed the past when he manipulated Laurie 90 seconds into the past.
He lack the ability to alter events, he thought that by changing a particular point would cause that timeline to exist but it didn't. Both timelines continued to exist creating multiple universes with every failed attempt. He was stuck in a predestination paradox.