The two witnesses are symbolicnot actual men but they are a symbol of testimony and the fire coming from their mouths"Testimony."It would appear that there is symbolican outpouring of the word of godHoly Spirit at this time.
In Acts 2:17-21 it is written,
"In the last days,God says,I will pour out my Spirit on all
people.Your sons and daughters will prophesy,your young men will see
visions,your old men will dream dreams.Even on my servants,both men
and woman,i will pour out my Spirit in those days,and they will
prophesy.I will show wonders in the heaven above and signs on the
earth below,blood,fire and billows of smoke.The sun will be turned
to darkness and the moon to blood before the coming of the great and
glorious day of the Lord.And everyone who calls on the name of the
Lord will be saved.
Two=testimony.According to the inhabitants of the earth the"testimony is dead"
The men of every people ,tribe, nation and language will refuse to accept that the "testimony of God" is dead (the two witnesses) and this is why they will refuse burial.They will not bury what is still alive.