9:19 For the power of the horses is in their mouths and in their tails; for their tails are like serpents and have heads; and with them they do harm.
For the POWER of the HORSES is in their MOUTHS and in their TAILS;
These are special "HORSES" because they don't obey the command given to Noah (Genesis 9:1-2-7) to have dominance over every beast, bird, etc. Certainly, the will to live has the people remaining during this sixth trumpet trying to find ways to stop these HORSES, but can't.
for their tails are like serpents and have heads; and with them THEY DO HARM.
This may be an extreme view, but this looks like homosexual encounters gone rampant.
If this truly is a creature, then it is awesome because just the time you think its leaving, the tail bites you and kills you (or HARMS you). How horrible can things get? This is bad but look at Deuteronomy 28:49-68. Is this what disobedience is worth?
A sidelight: The clear physical cannabalistic nature of mankind will be revealed during this time. If a person believes that the redeemed are taken up by this time, then love has been removed from this earth. All that is left is to look out for "NUMBER ONE"! Then, it is entirely possible that no one is going to come to the aid of another or try to control the HORSES.