Construction:

the "receiver" or "frame" is made from 2 hollow pieces of injection-molded hard plastic fused together down the middle. The grip is has a core of hard plastic with a softer plastic covering it. The trigger, trigger axle and axle mount are all made of metal, as are all linkages.

The arms are spring loaded and must be folded back manually. There is no mechanical linkage between the arms, so they each have to be folded back individually.
Position 1 and 2 shown above. Position 1: Arms are retracted. Position 2: Arms are extended. Position 3 (not shown): the magnet arms extend further, making the magnets contact the head and apply pressure (additional "grip"). Position 3 refers to the maximum of this extension.

Battery is located in the bottom of the grip. This is to offset how front-heavy the device gets when in position 2.
Capacitors located above the side arms along either side of the top part of the frame that catches the top arm when folded back to position 1.

Operation:

Once a target is located, operator pulls trigger to the first stop. This releases all the arms to swing into pos 2 and causes capacitors to charge. Once target is sufficiently distracted and capacitors fully charged, operator sneaks behind target and places device over target's head (grabs their head with the claw) then squeezes trigger. This causes the claws to squeeze toward pos 3 and is powered by direct 1:1 cable linkage to the trigger. Operator must have a strong grip.
Once the trigger reaches the halfway point between pos 1 and pos 2, helium is sent through the tubes to the magnets where it cools them to superconducting temperatures.

Then, after a carefully timed delay to allow time for the magnets to cool down, capacitors dump all their current into the electromagnets, causing a brief spike in magnetic field between the claws followed by an immediate collapse, inducing a brief but powerful current in the brain of the target, inducing SWA in target
Operator must then replace the helium tank, as it contains only enough coolant for one use. Any more would make the device too heavy to be practical. The tank has to be extra heavy in order to contain the pressure that helium will put on it, and due to the nature of helium (it will leak through even the best valve), each tank must be filled prior to mission execution and emptied upon completion.

Additional note:
If there were a way to create coils with Yttrium Barium Copper Oxide (YBCO) that could bend around a core, then the use of helium would be unnecessary and the device could instead use liquid nitrogen as its coolant, since YBCO becomes superconducting at 93 K and liquid nitrogen's boiling point is 77 K. I wan't able to find any info about its mechanical properties and, having never worked with it, I assume it is a ceramic and quite brittle.
Liquid nitrogen is a LOT cheaper and easier to make, store and dispense than helium, so it would be greatly preferred.

High res available to all patrons here:
https://www.patreon.com/posts/35836227