I have now asked my "real" question (one whose answer effectively answers this question) here ("[Are getting hit and taking damage simultaneous events](https://rpg.stackexchange.com/questions/153591)").

---

The [*shocking grasp*](https://www.dndbeyond.com/spells/shocking-grasp) spell's description states:

> 
> **On a hit**, the target takes 1d8 lightning damage, **and** it can't take reactions until the start of its next turn.
> 
> 
> 

It is unclear to me when the reaction prevention actually occurs (on being hit or on taking damage).  

I have found this Q/A ("[Would Shocking Grasp prevent the target from casting Absorb Elements?](https://rpg.stackexchange.com/questions/135190)") where a comment from @DavidCoffron says:

> 
> [*shocking grasp*] interrupts the damage taking (which is the trigger), not the hit (which causes the reaction-block)
> 
> 
> 

And then there is this Q/A ("[Can the Shield spell be used against Shocking Grasp?](https://rpg.stackexchange.com/questions/105449)") where the following sentence exists in @chaoticgeek's answer:

> 
> In addition you take damage and can't take reactions together so if you can prevent the first you have to prevent the other **since it is a chain linked by 'and'** in this situation...
> 
> 
> [T]he reaction prevention only comes with the damage that is dealt
> 
> 
> 

Does the 'and' in *shocking grasp* really link the clauses enough to make them simultaneous? Are the hit and the damage happening at the same time?  

Does *shocking grasp* prevents the target from taking reactions once the spell *hits them* or once the spell *damages them*?

---

I do not believe that this Q/A ("[When Shocking Grasp hits, can it trigger Wrath of the Storm reaction?](https://rpg.stackexchange.com/questions/90941)") is a duplicate of mine because I am specifically wondering when you are prevented from taking reactions, which (as the quotes above show) does not seem to be entirely agreed upon.