You can damage or even kill a red player when they are in their residence. I ran this glitch 3 times than recorded it from both sides. If a red player is in their residence you enter your residence of the same house. Your pets will ping the red player even though they are in their own residence. You can attack where your pets are pinging and the red player will take damage without seeing you or being able to damage you. You will be able to see the red players name and they will see yours as they take damage. 

https://cdn.discordapp.com/attachments/1085890335860858900/1085890593072353310/125388a2-624e-4bdf-8fda-33571913396b_1.mp4

https://cdn.discordapp.com/attachments/961475302373093416/1085889078878277673/dda2ac65-de79-40a7-bd3c-858d9b19e3c7.mov