Troll Under the Bridge is right the friend getting the Trooper, was the best path. I even used it myself in a bar before, I just asked the bouncer to keep an eye on the dude.

Another bar scenario, I am dancing with a woman in the middle of a dance floor. When big guy with an attitude tells me get ...

Having been in similar situations, my response to the woofer is usaully to agree with he says or just be non-commital(ok, whatever dude)Even if I totally feel the oppsite way. If the guys continues to advance I might take a step back or two at max.

All this is to make him feel he is winning ...

In a folder for my average size hands, a four inch blade feels just right. I have handled larger folders but then you just have too much handle sticking out. I do own two 2.5 inch folders(Harpy&Merlin), for more discrete carry and for when local laws require it. But they definetly don't fill my hand ...