Problems with the silence spell

[Orzhov and gruul]

Okay. So like, me and a friend of we're playing, and the weird things is we castes our spells at the same time: he cast {silence} when I cast {shock}
On his turn!

So we are stuck here... What could we do?

[DylanW18]

Who cast their spell first exactly?

[Sardok]

It doesn't matter who cast what first. If nothing is countered, both will resolve.

While {Silence} is still on the stack, you may still cast spells in response.

[Orzhov and gruul]

THANKS ^_^

[Steerpike]

If I may springboard from this topic:
When is the earliest I can cast {Silence}?
I suppose that is the same question as:
When my opponent's turn begins, when is the very first time they technically pass priority to me?

I assume that to get the most out of it, I would be allowed to cast it after they draw and before Main Phase 1

[Ekann1]

If I may springboard from this topic:
When is the earliest I can cast {Silence}?
I suppose that is the same question as:
When my opponent's turn begins, when is the very first time they technically pass priority to me?

I assume that to get the most out of it, I would be allowed to cast it after they draw and before Main Phase 1

The first time you get priority on your opponent's turn is during their upkeep.

502.3. No player receives priority during the untap step, so no spells can be cast or resolve and no abilities can be activated or resolve. Any ability that triggers during this step will be held until the next time a player would receive priority, which is usually during the upkeep step.

503.1. First, any abilities that trigger at the beginning of the upkeep step and any abilities that triggered during the turn's untap step go on the stack. (See rule 603, "Handling Triggered Abilities.")

503.2. Second, the active player gets priority. Players may cast spells and activate abilities.

RESOLVED