User blog comment:Legionwrex/Reaper vs thresher maw, who would win/@comment-1441235-20110414050347

I'm fairly certain the Reaper pulled underground by the Thresher wouldn't have been a full-sized Reaper on the same scale as Sovereign or Harbinger. Those two and the others like them are so massive as to dwarf a thresher maw. I think the one from the scenario would probably be a smaller type Reaper, so any guesses as to its power would be pure speculation.