From the news you linked it seems that the attackers went to an ATM and it ate one of the cards for whatever reason. > Both students must have provided their a

From the news you linked it seems that the attackers went to an ATM and it ate one of the cards for whatever reason. > Both students must have provided their assailants with their pin numbers. However, one nearby cash machine retained Ferez's card. "So to take revenge for the fact that they had been unable to steal money from Mr Ferez," the court heard, "both men were murdered in a way that one can only describe as inhuman."