Revenge question

I don’t agree with attacking someone repeatedly but get it’s part of the game. The only time I do it is if I am taking revenge on someone who did it to me. That said, the last two times I have tried to take revenge I am immediately unfriended after one strike.

Just now I attacked someone who hit me several hours ago. I landed on shutdown, hit them, then immediately landed on shut down again and they were no longer an option. I don’t know how they could have unfriended me that quickly. It’s the second time it’s happened like that in two days and I don’t remember friending either of them.

Is there something else going on or is it that they likely were just really quick to unfriend me?