I see Vex communication barriers like this: You see an ant hill. A trail of ants are working on a piece of candy that someone dropped. You want to redirect the ants, without harming them. You could move the candy. Ants can smell these things for literally two miles. Of course if you move it too far, the ants will consider it a low to no priority task and ignore it. You could disturb the earth or add obstacles in their path, which could harm them depending on the method. You could use some innocuous chemical (spray deodorant for example) and disrupt their line of communication with each other. You run the risk of permanently blinding them chemically. And then you could send a fake signal. You’ll need analyzing equipment to determine the correct combination of chemicals and pheromones, you’ll need to replicate this concoction and finally you’ll need extremely small amounts in a minute delivery system or you’ll just end up blinding them. Now that I’ve said this, it should be no myster why the Vex either ignore us or just shoot us on sight. We are ants to them.