Being discussed at length, at least IMO in this thread
http://www.pokertda.com/forum/index.php?topic=1103.15 (See page 2)
We discussed this in heated debate in 2011 when the TRUE rule was adopted.
2011 version - Substantial Action is defined as either: A) any two actions involving two player each putting chips in the pot (bet, raise or call); or B) any combination of three actions (Check, Bet, Raise, Call or Fold).
I am completely bewildered at how it got to the 2013 version. I don't remember this topic being brought up at all. I think someone made a tragic typo and put it in print.
2013 version - A) any two actions in turn, at least one of which puts chips in the pot (i.e. any 2 actions except 2 checks or 2 folds); OR B) any combination of three actions in turn (check, bet, raise, call, or fold).
The 2013 version is COMPLETELY ASININE!!! No one in the history of poker ever defined substantial action as one bet and a fold. NO ONE!!! NOT EVER!!!
Don't feel like your being rude GG. Follow your instinct and know that you are right to follow the 2011 version. The 2011 version would have been best written as:
Substantial Action is:
A) any two actions in turn that involve putting chips in the pot (i.e. any bet and call or 2 calls or raise and a call in turn); OR B) any combination of three actions in turn (check, bet, raise, call, or fold).
Somewhere somehow someone or some group got very confused. I'd pull my hair out, except I have none.