how to attack one specific person?

[Denniz]

Some of my allies were attacked by the same person multiple times. How is this possible? I thought attacks were random. So how do you attack the same person multiple times?

 

[DanQ]

I see two possible reasons for this, and they are not necessarily mutually exclusive.

1. On the (primary) basis of Medal Count, the game's algorithm determines that Player X should attack Player Y where Player Y is the same (again).
2. When Player X attacks Players Y, as the defender Player Y is given the option to strike back by clicking on the 'Revenge' button.