It's not non-chalant, it's knowing yourself and the confidence you BELIEVE you will have (and DO have). Period.
If someone is gonna carry a gun to feel cool or feel powerful blah blah blah then hey, that's great. I'm just saying I carry and BELIEVE I will be 100% cool when and God forbid if I should ever have to use it.
You either BELIEVE in yourself or you "think" you might do well in a fight. Walk into a UFC fight not a hundred percent BELIEVING in yourself and you might as well tap out during the introductions... Stand in the on-deck circle with a hint of doubt that you can get a hit off of Clayton Kershaw and you can just tell the ump to yell "Strike Three!" as you're walking to the plate.
Strap a gun IWB in the morning with any doubt that you'll be supremely confident should you need to draw and use it? You might as well just call 911 instead.... I'm not being non-chalant nor callous nor anything in what I said, other than that I believe in myself, and my abilities, and my training, and, especially, in my ability to remain calm when sh*t goes down. I hear a LOT of doubt casters here saying "Well, you'll probably be nervous and heart racing" etc when presented with a "situation".
Buy into that mentality if you choose, but I'd rather believe in myself that I will be cool before and after an "incident". Everyone is different in life, not everyone handles things and reacts to things the way others do. You read every day about "heroes" who acted cool when others sh*t their pants or freeze up, etc... I just happen to BELIEVE that I'd be calm and cool before AND after an incident, and I'd rather live with that BELIEF than with any doubt.
I sincerely hope to NEVER have to find out, but.... you call it "non-chalant"... I call it "believing in yourself". Period.