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Radiologist here. There are multiple safety zones (four to be precise) around the machine and extensive screening procedures are required to access the inner zones. The magnet of an MRI is always on and extremely strong. However, you need to be pretty close for it to pull a gun from your hands. Like, less than a few meters. That would be zone 4. He should never have been that close.
The button he pressed is called a quench. It's for life threatening emergencies only. Think "patient trapped between the machine and a metal object." It vents the liquid helium used to keep it superconductive and basically destroys the machine, but the magnetic field dissipates in minutes. There is a way to wind the machine down without destroying it in situations that aren't life threatening or for servicing, but it takes hours for the magnetic field to dissipate and even longer to bring it back.
Could you unplug your MRI machine and put a Kil-a-Watt on it for me? I'm really curious how much they consume at idle.
These machines are typically wired to electrical directly. I would expect they are powered using 480 VAC. Google states they typically use about 14kw in standby mode and up to 80 kw for a scan.