Following are a number of back-translations of Revelation 9:19:

• Uma: “On the tails of those horses, there were [things] like the heads of biting snakes. With their tails, they tortured mankind. So, those horses tortured and killed mankind with their mouths and with their tails.” (Source: Uma Back Translation)
• Yakan: “But those horses had two different things for killing the people, firstly what came out of their mouths, secondly that at their tails. Because their tails were like snakes, they had heads for biting the people.” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “For it is in the mouths of the horses that they have power to kill and also in their tails because their tails are like snakes because they have heads on them and those tails can harm people.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “Because the power of those-aforementioned horses to kill, it was in their mouths. They also used their tails to injure people, because their tails had heads (lit. were-headed) like the head of a snake.” (Source: Kankanaey Back Translation)
• Tagbanwa: “The ability of those horses really was in their mouths, and in their tails which were like snakes having heads which they used to strike with causing suffering.” (Source: Tagbanwa Back Translation)
• Tenango Otomi: “The horses had death in their mouths, they had death in their tails. For the tails of the horses bit like snakes bit people.” (Source: Tenango Otomi Back Translation)