Two hints this time.
Hint #1 Someone has indirectly touched on the "error".
Hint #2 The player who "mechanically" applies the attack and defense factors may (or may not) calculate an incorrect hit probability.
Hint #3 It is not a punctuation error, grammar error, spelling error or additional lines.
Hint #4 Possibly too much focus has been placed on individual trees rather than the forest.
Hint #5 It is an error of d _ _ _ _ _ _ tion.
I will be adding a letter until someone comes up with the answer.
I must say, I never thought it would go on this long!