And Physics said, “Thou shalt not grab thine front break in a panic whilst descending. Particularly so when thou art descending quickly over a large tree root in the middle of the trail.” Blessed be the Word of Physics.
Indeed. Such blasphemy invokes an epic battle – the struggle of momentum, deceleration, and center-of-gravity. You’re moving fast and as the momentum tries to keep you going forward, a deceleration force will try to swing you in an arch. The pivot point of this not-so-graceful arch is the contact point between the front wheel and the ground (cue the image of my body detaching slowly from my bike while careening skyward and then, suddenly, forest-floorward).