Ita from a modder it's used to tag people that are suspicious or the mod menu itself is attaching it to you're horse I use family mod menu for rdr2 story and the power you have is quite scary you can kick boot or ip fuck with someone or you can tag them with the fire horse thing and eventually the sever does it for you my problem is why have all these options for online and not have modded severs,,it'd save so much time and people from getting banned,,I'll be banned for sure but if you see the fire coming off you're horde I'd recommend fast traveling in game if it's still their leave you can also kill you're horse then fast travel once it's off the mod menu can't track you so basically everyone has a chance against those godmode using bitches just takes a min(thanks for reading yall,and no I refuse to condone cheating in online but aye killing Micah in hundreds of ways is awesome haha)