It's not the scalpel itself, but some sort of secret technique.
A bit like the 'Qi-Blood Secret Martial Arts' from the last instance world.
The other person is a 'Gunslinger'.
Cloaked in a black leather coat, wearing a matching hat, with a rectangular box on his back, holding two silver revolvers, he elegantly and deftly dodges his opponent's attacks, simultaneously firing lethal bullets as if performing a deadly waltz.
The last one, judging by the gasps around, should be the 'Puppeteer'.
A gray-black robe drapes over her body and face, making it impossible for ordinary people to see clearly.
Yet her outstretched hand is fair and slender.
When she just dodged the shrapnel from the grenade explosion, her light hum confirmed to Jason that she was a woman.
