he who hesitates is toast

He takes the tablet from the monitoring station and makes sure that the software modification is in place. It is. The system's cut off from the outside, to prevent any of the ex-security team or anyone else in Madripoor from trying to get a look at what's going on in the gallery. He keeps the tablet with him as he makes his way through the building, watching for any sort of alert, watching over Sharon as he works.

He destroys the cameras that would show the car leaving the garage, and leaves the others for now - he'll destroy them too once they're in the car, but needs them to monitor for unauthorized access until then. He scans along the wall and breaks through the concrete to reveal the natural gas lines that feed the building, then rigs the valves and pipes to explode as soon as he activates the trigger. He does the same thing on the level right above the gallery, in the unfinished lofted ceiling below the living space above.

When he finally returns to the penthouse, he's lightly covered in concrete dust and oil, smells like smoke, and looks as grim as he ever has.