The laser cutter is an option in Stealing the Diamond during the "Unseen Burglar" pathway that Henry can use after he drops down to the Diamond via a wire with a hook on it.
Description[]
The laser cutter resembles a stereotypical laser cutter. When it is activated, it uses red lasers to cut through material. If the player makes their cursor hover over the option, the laser cutter will make a full circle with its arm.
After his descent from the balcony, Henry tries to the Laser Cutter to cut through the glass case of the Tunisian Diamond, but the laser, after a temporary jam, cuts through him instead, leading to a fail which involves Henry getting split in half at the waist and collapsing.
Fail Message[]
U GET CUT!
Y U NO BLEED!?
˙ʇᴉ pǝzᴉɹǝʇnɐɔ ɹǝsɐl ǝɥꓕ :∀
Trivia[]
The upside-down text reads "A: The laser cauterized it."
This explains how Puffballsunited dosen't want to make that game to have blood in this game. As seen in here.