"What's gunpowder?" Link asks. The 'gun' part at least clued him in that firearms were related to the guns everyone seemed to use around here. But how exactly powder featured into all of this, he didn't know...

"We do have Ancient Sheikah technology, in Hyrule," Link says, holding how the Sheikah Slate to show Rokuro. "But it was all buried and lost, until just before the Calamity. I don't know how it works."