I think Mex, a professional alternator rebuilder by trade, tried to say to use the vehicle donating the jump to Charge the recipient and not actually Crank it. I've been taught, and probably not adequately, to let the donating vehicle run awhile before attempting to start the recipient. Then let them run "together" before disconnecting the jumper cables. Mex is saying Charge, Disconnect, Start. That's the safer approach. I personally have not seen a problem, meaning damage, unless the jumper cables got shorted (including grounding the positive) or reversed.
