Challenging the minds of others around you, drawing them into a graceful and well thought out battle of minds. Therefor building respect and understanding of opinions and outlooks.
Arguing with no hostility.
My head hurts, Chris and I have been Mental fencing for hours.
William you are quite intelligent and a great Mental fencer, it's been a pleasure waging battle against you.
James stop trying to Mental Fence me, I get your point.
Who dares wage their mind against mine, I am a skilled Mental Fencer.