Probably safe. "Gotcha." Om nom nom.

"I feel like I ought to ask questions about the future but now that the opportunity has come up I can't think of anything."

"It can't be actually the future, it's clearly an alternate universe situation - maybe you just meant the future of technology - let's see, we have airplanes! Vehicles that fly through the air very fast."

"...Thaaaat sounds absolutely terrifying."

"Surprisingly enough, flying is really boring. You're shut up in a metal tube wearing a seatbelt crammed in pretty close quarters so more people can fit in one such tube at a time, there are windows but even looking at the tops of clouds gets samey, and if there's any exciting weather it just feels like being rattled around, not like really flying."

"I was referring to the part where you could put cannons on it and kill people."

"Oh, yes, that also happens. Well, not cannons, cannons are obsolete."

"...I am very sorely tempted to tell you to go back through the portal and then never to tell anyone that you existed."

"I cannot go back through the portal, I don't know how I got through it in this direction in the first place. And it seems unlikely my end of it will want to just leave it alone."

"If you give Anglia a two hundred year head start on killing-people technology it will try to become the new Rome and many, many people will die."

"Then they probably won't do that unless they discover some compelling economic reason to do it - I'm not trying to paint them as saints but there's not a really clear incentive to make cannons obsolete through this portal here."

"If you send us books of natural philosophy we can probably handle the applying-it-to-killing-people part on our own."

"I unfortunately do not have our current policy towards developing countries involved in warfare with other developing countries particularly well-researched."