Of course it was a katana, why was I even expecting anything more interesting. Anyway, here to correct some weird misconceptions about katanas, longswords, and rapiers I've seen in the comments:
No sword is made to strike at armor, they can pierce through the padding underneath and snap maille rings if thrust well, but a longsword blade will look as bad as a katana blade if repeatedly smashed against plate. Sharp swords get nicks really easily, I have gotten small ones in the blade just by trying out the feel of the bind with sharp. The advantage European swords have when it comes to reliability is the steel quality; European swords are made of spring steel that will return to shape if bent, a katana will remain straight until it snaps. All edges accrue damage from contact with the opponent's blade. A longsword won't shatter a katana, and it won't survive blade contact with one without any damage, but it's likely going to come out slightly less damaged.
Katanas and longswords can and in practice do cut in the exact same way, you don't have to do a draw-cut to cut with a katana. In fact, a katana is super easy to hew cleanly with; it's thick, heavy for its length, and rigid. All of this helps turn a botched strike into a really great cut. You can of course also do push- and pull-cuts with both sword types. No blade will cut anything if you simply place it on your hand, they all need either tip-speed or sliding motion. Or both.
Rapier's are pretty sturdy, they tend to weigh almost as much as a longsword, and being made from the earlier mentioned spring steel, take punishment relatively well and return to shape. Here's a video of some guys trying to break a training rapier by hitting it with blunt longswords: https://www.youtube.com/watch?v=cFRxZod-iI0
Love, a HEMA autist.