Here's a cool pic of catch wrestler Nat Pendleton performing an armbar in assistance to a pin (top pic):
http://www.ifrance.com/lutte-wrestling/pendleton_14310.htmlThis link was recently posted on MMA.tv by good ol' Scuffler, our resident wrestling historian.
It shows the submission approach that was often favored by catch wrestlers--ie., using subs to coerce a guy into a pin. Scuffler pointed out how Pendleton is on his side, so as not to have his own shoulders touch the mat, while his opponent is bridging to attempt to avoid the pin.