Wild Magic Surge - Extra Action

One of the entries in the 5.5e Wild Magic Surge table (53-56) says that it allows you to take an extra action "on this turn".

Much of the time "this turn" is going to be your own turn, but as far as I can tell there's nothing that prevents a Wild Magic Surge from happening if you cast a leveled spell as a Reaction on someone else's turn, like casting Shield in response to someone attacking you on their turn, or via War Caster's "Reactive Spell" feature.

So, if you do cast a spell on someone else's turn, and it triggers a Surge, and you end rolling that entry on the Surge table, do we think that grants you the ability to take an action on the current turn, even though it's someone else's turn?

I'm inclined to say yes, on the grounds of "things do what they say" and also "It's no fun to get a surge and then have nothing happen" and "wild magic should mess with things".

What this would mean in practice is you get a little interrupt to the other creature's turn, and do one action right then before handing control back. (But it's not your turn for all the stuff that cares.)

But it'd also be reasonable to shove the extra action off to the sorcerer's turn to avoid excess confusion.

I'm not a fan of just dropping the extra action on the floor, but I can't say it's an unreasonable ruling.

(Also, I should give my wild magic sorcerer some reaction spells next time I level. :)

Edit: just checked, and there's definitely nothing stopping this from happening.

I agree it seems like it should work. There’s the timing of it that you’d have to decide on. Someone comes at you with multiattack, you use shield on the first and it gives you this extra action. Do you use it right now before the attacker gets their next attack, or do you resolve the multiattack and then you get your off-turn action?

Quote from Xalthu >>

I agree it seems like it should work. There’s the timing of it that you’d have to decide on. Someone comes at you with multiattack, you use shield on the first and it gives you this extra action. Do you use it right now before the attacker gets their next attack, or do you resolve the multiattack and then you get your off-turn action?

Based on the wording, perhaps the creature who is receiving this extra action gets to choose the exact timing of it.

Rule says

"You can take one extra action on this turn"

So id say if you happen to trigger this on your reaction, its the other person's turn, and the extra action, as written, would happen on this turn.

https://www.dndbeyond.com/sources/dnd/phb-2024/character-classes-continued#WildMagicSurge