Just played a game of Historic Brawl on my Mobile device and my opponent activated a bunch of landfall triggers and played cards on my turn in response to me playing my commander on my first main phase. They somehow controlled my triggered abilities of my orcish bowmaster to deal dame to me and then proceeded to go to their attack step and attack me all before my first main phase had concluded. I Believe the game glitched out because it was acting like it transitioned to their turns main phase when they activated abilities of their creatures on my turns first main phase. There was no cards in exile, on the field, or in the graveyard to give them flash or the ability to control my turn. And the game proceeded normally otherwise because there were no frozen screens or card effects not loading while this happened.