[Henry nods at the part about magic, not stopping drinking it just because of that small piece of information. The question, however, he did have to stop drinking to answer.]

It wasn't on purpose. After Zelena copped it, the portal she created re-opened and they fell through.

[He pauses for another drink, then realises Gold doesn't know about this yet or he wouldn't be asking.] Wait, if we're from different times, I shouldn't be telling you about the future. What's the last thing you remember?