Revelation 11:6
6 They have power to shut up the heavens so that it will not rain during the time they are prophesying; and they have power to turn the waters into blood and to strike the earth with every kind of plague as often as they want.
They also have the opposite power, to stop the waters from turning into blood. Watch the water.
Revelation 17:15
15 Then he said to me, “The waters which you saw, where the prostitute sits, are peoples and multitudes and nations and tongues.
Signatures are important.