This reminds me of the CEO of a cyber security company that challenged Anonimous https://en.wikipedia.org/wiki/HBGary. If you work for any kind of security company, do not ever ever ever challenge any kind penetration specialist. Everything is hackable, it is only a matter of cost vs reward, but when you challenge someone that goes out of the window.
Generalizing the advice..
Don't challenge people. Don't insult people. Don't humiliate people. Don't threaten people. Allow them to maintain their self-respect even when they lose. Don't rub it in. Give them a face-saving exit.
Plenty of violence and aggression is caused by violation of the above rules. They seem simple but they're broken on a daily basis. Famous last words: "you don't have the guts".