DnD resolves things sequentially
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When you do multiple things to a target, like two attacks, or cast two spells (action and bonus action spell), **you choose the order of the actions**, except when the description says otherwise.

Example: if you cast *misty step* and *shocking grasp*, you can choose the order of the action. You can cast *misty step* to get in range of your target, then cast *shocking grasp*. Or you can cast *shocking grasp* first, then *misty step* away without provoking opportunity attack.

Example of exception: **Shield Master** says ***if you take Attack action**, you can do as a bonus action ...*, means you must take Attack action first and resolve it, before being able to use your bonus action to shove the enemy.

Attacks are resolved individually, meaning one attack and anything triggered from **the attack** is resolved separately, then after that the other attack is resolved.

In your example, if one of your attack cause the target to become prone, and another explodes (Bursting Arrow), after you choose the order of attack (prone -> explode), you resolve them separately.

1. Apply damage, then target become prone, and immediately fall up to 500 ft per turn.
2. Bursting Arrow now deals area of effect damage around on where they landed.

Note that you can declare each attack **after** the other resolve, meaning seeing the first target has fallen down and now is out of reach, you can choose another target.

You can also use Bursting Arrow first, then knocking them prone, if you want.