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Scilly.Suffolk-
dunno - but I managed some time ago
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How can you unwind a pedal by pedalling (forward)?
You don't, but it's possible to come off if not tightened properly.
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Precession
Mechanics. the motion of the rotation axis of a rigid body, as a spinning top, when a disturbing torque is applied while the body is rotating such that the rotation axis describes a cone, with the vertical through the vertex of the body as axis of the cone, and the motion of the rotating body is perpendicular to the direction of the torque.
Thuekr
edscoble
freezing77
He gone fucked it up, not you.
Fitting it by hand mean he managed to unwind it while pedalling and cause damage to the thread when it come off by force.
Time for a new crank arm, and actually use a spanner next time.