Someone who isn't a regular and aggressive gambler cannot do something like that. If I'm not a regular gambler, and I barely make a bet or two, and if I'm invited to a get-together where we have to play friendly and non-gambling games, I wouldn't do anything like that because I wouldn't have that thing in me that would keep tickling me to become aggressive and start making arguments and take everything very seriously and make the environment tense.

What he did shows that he is either already a gambler or he has a very aggressive nature because you will also find people who are naturally aggressive to do things like that no matter what they are doing, they get serious in almost everything they do even if it is a friendly game being played among friends.