Hello, i was in battle vs an american when in the middle of this battle 4 players jump as same time, one on my side and 3 on the enemy. 2 of these players are the same, the russian player Hartz and his alter LladHartz. I had to abandon the battle. He do the same in other battle again, making room for joining more americans.
He said me on his american account that this americans are under his protection, making in my opinion an abusive use of BR mechanics, and forcing me to leave both battles.
I send 2 F11 reports NAB-93572 and NAB-93576
Screen of first battle (sorry i forgot screenshot of players, i suppose that F11 report have that):
Screen of second battle. Hermione join to battle on timer, consti few seconds after joining Hartz: