Rev 1:1 The revelation of Jesus Christ ... He made it known by sending his angel to his servant John, ... Ref. NIV
I suggest that Jesus Christ sends His angel with His Hades key to open the abyss. This event allows the Beast to come up out of the abyss to kill the two witnesses after they "complete their witness" (Rev. 11:7)(day 1261). Rational: Rev 1:1 The revelation of Jesus Christ ... He made it known by sending his angel to his servant John, ... Ref. NIV