FrogReaver
The most respectful and polite poster ever
I'm using the word timing because that's what the bonus action rule uses.
Again, JEC has made it clear that some bonus actions follow an "if X then Y" model, and X must happen before you get the bonus action Y, and that this is what the words above in bold mean in the context of the bonus action rules. Or, in other words, there are two classes of bonus actions.
1) The bonus action itself has some kind of "if X then Y" trigger, and X must happen before you can do Y.
2) You just have the bonus action, and can do it any time you like on your turn.
If you don't think "timing" is the correct word to use to describe the first case, fair enough.
Right, I believe the bonus action rule about "unless the bonus action's timing is specified" doesn't apply to shield master. I believe you can choose when to use the shield master bonus action shove during your turn. However, I don't believe you even have the shield master bonus action to use before you take the attack action because of the "if you take the attack action then you can bonus action shove" (paraphrased) coupled with another less familiar rule I quote below.
See the difference in my construction? Nearly the same outcome but the way I get there is much different. I avoid timing issues altogether. The way I can say shield master doesn't specify timing and still get out of saying shield master can be used before the attack action as the rule you cited would seem to imply is by remembering another rule below:
You can take a bonus action only when a special ability, spell, or other feature of the game states that you can do something as a bonus action. You otherwise don't have a bonus action to take.
I view JC's tweets about the meaning of the "if then" clause in shield master more as a reference to the rule above than as a ruling about timing.
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