Traps
Kane swiftly returned to his base of operation, namely to the place where he drew up all of his civil design plans. Despite modern technology not being usable anymore, that was only limited to things that required electricity. Thankfully, Kane had always been a believer of keeping hard copies, as one of those old-timers.
He had been given a hard time on many occasions when he was seen drawing blueprints by hand. He would be called Dinosaur, amongst other names. There wasn't any particular reason as to why he liked drawing by hand rather than drawing them on computer, perhaps it was just enjoyment.
Either way, before the Calamity descended, Kane would often draw blueprints for various siege equipment that were made popular in the middle ages. In fact, one of the main reasons he had gotten into engineering was thanks to his love for these long-outdated weapons.