Your claim is false, the (Two Witnesses) dominate the great tribulation through Gods plagues and wrath as seen below
Obviously they do not rule in the Great Tribulation. The rule is allowed to the two beasts with the help of Satan. The 2W can only act in self defense so their testimony can take place but as soon as that is finished, they are killed.
It's called a tribulation for a reason because Christians will be persecuted and killed. It's not the "great rule of the two witnesses".
Listen to Christ on this time period:
Mat 24:9 Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name's sake.
Mat 24:10 And then shall many be offended, and shall betray one another, and shall hate one another.
Mat 24:21 For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.
Mat 24:22 And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.
If that's the rule of the 2W, they are doing a horrible job.