Matilda wanted revenge, and the male protagonist taught her how to use a pistol.
But she was still a child, without a permit to buy firearms, so in the end, the male protagonist took her into the black market.
He let her choose her own weapon, and ultimately, the girl hoisted a bronze cannon.
"No, we're assassins," the male protagonist looked at the cumbersome thing in Matilda's hands with a face of utter collapse. "How are you going to carry out an assassination with that thing."
"But didn't you say that if we kill everyone, there'd be no one to know we were here?" the girl asked.
"But with that thing in your hands, just one shot will let half the city know we've arrived," the male protagonist argued with reason.
Matilda held the bronze cannon upside down, returned the cannon that could have been an heirloom for her to its place, then picked up a pistol with her hand.