That statement has no subjects. You can infer agents or subjects, but there are no grammatical subjects there.Well, I'm of the school of thought that those phrases are filled with meaning. "To do it, do it" has 2 subjects, the player and the character.
If AW doesn't have out of character, then the statement above can't be referring to the player.The first phrase tells you what the player's need is "to do it" and the second is the in-character process "(you) do it" where you is the character (the player in character, and remember, AW doesn't HAVE out of character, except maybe to solve a rules dispute).
Similarly.Same with the other one. If you (the player) do it, you (the character) do it. And the immediate form of the verb 'to do' making it NOW. It's not "if you did it, you did it." nope! Its wham bam that's it the thing just happened! Much like real life, you stepped off the curb, well maybe you thought better of it a second later, but the truck still hit you.