The top floor of the central tower is quiet, with much of the day’s activity having moved downstairs. Anyone working late, however, will hear the sound of brisk footsteps going through the corridor, followed by the creak of opening doors and the tinkle of glass.

If unfortunate enough to be inside one of the offices, they will need to be quick on their feet: a mist rises from within the smashed vial, which immediately begins to manifest adverse physical reactions, such as increased heart rate, darkening of vision, and a closing of the throat. If they don’t escape immediately, anyone in the room will die.
Walking into the closed room after the fact will be similarly risky.