It depends on if they know it ' s magic or if they think it might be some kind of trick . I assume it would be the former , but it can be either for what I ' d think the outcome would be . I ' d imagine the game would end pretty quick . I can ' t see the thousands of people involved to go Oh , actual magic . But that ' s totally normal and ok because he ' s on my team . Regardless of whether the muggles know or not , the officials would suspend the game immediately to try and figure out what the hell is up with the guy and what to do probably eject him if they know he ' s not going to be violent . I don ' t think this would fit the Well , it ' s not against the rules so we can ' t do anything trope . In real life I think there ' s a bit more autonomy of officials acting in extenuating circumstances . As for worldwide reaction , it ' s hard to speculate . But I ' d assume news like guy uses magic at basketball game for some reason would be quickly overshadowed with OMG MAGIC IS REAL type of news . And then it would play out in some pretty typical humans discover magic exist and react to it scenario .