Hi Donna, 

I believe that God's Two Witnesses are continuing to witness while they are dead for 3 1/2 days before they are resurrected back to life, by God , and  then called to heaven at mid-day on  day #1,260 just as Jesus was witnessing while He was dead for 3 days before he was resurrected back to life,  by God,  and ascended to heaven.  Revelation 11:12 states , "And they ascended up to heaven in a cloud, AND THEIR ENEMIES BEHELD THEM." which proves they were still witnessing to their enemies while they were dead , and when they were resurrected, and when  they ascended to heaven ON DAY #1,260 AT  MID-DAY. 

Blessing to you !