epithet
Explorer
No. No they aren't happening concurrently if you are taking the bonus action BEFORE you take the action. Imagine the following scenario. The DM has an enemy with a Hold Person spell readied to cast on your fighter if your fighter moves. On your turn you take the shove action and knock down the enemy in front of you, then you move 10 feet to take that Attack action, except the Hold Person spell goes off, you miss your save and cannot take the Attack action. They would be concurrent if you actually took the Attack action and at least one attack first, since you aren't even in the process of taking your Attack action until that first attack happens.
According to Hriston, time travel occurs and the bonus action somehow becomes the action, or we have Schrodinger's action where we don't know if the shove is alive or dead until the end of the turn.
Those mostly aren't time travel. Most of them make you use them before you know whether you've succeeded or failed, so no time travel is involved at all. Shield is the only one I can think of that can turn a hit into a miss, basically being time travel, and I have an issue with that part of the spell
Well, yeah, obviously in your scenario the character's shove should be considered an attack as part of the Attack Action if it somehow matters, but the only reason it would matter is if the character wanted to use a different bonus action, right? Otherwise, the character is held. Can't use bonus actions, can't use the rest of his movement, etc. I mean, you could rule that since he announced his sequence to include a bonus action shove, that he was committed for both his action and bonus action even though he was locked down, which is how I used to rule it. You, however, seem to place a lot of faith in Jeremy Crawford, and Jeremy has advised against a declaration having any weight, so you might not be inclined to adjudicate it that way.