I’m a big fan of mind control. I sadistically enjoy turning those dim-witted crabmen against their brethren and see a siren’s dumbstruck face when she realizes she’s not the only one… 
OK, let’s get back to serious!
When mind-controlling a shield-equipped arthron, I don’t understand how the shield actually works. The skill description recites “deploy the shield in a given direction”, however it is impossible to understand which this “given direction” is. The UI shows 4 red arthron icons, with no hint on which one selects which side.
I suggest to change this visualization with the yellow circle on the tiles near the arthron, just like “dash” and “place turret” skills, or any other way to make this feature actually usable.