I was wondering if there is a condition that I don't know of or someway I could detect through triggers that someone either visioned or un-visioned someone. I want to use this to set off certain actions.

Details of how these players are allied to eachother would be useful if you don't want to get into EUDs -- otherwise...



I believe you can simply use these values Shared Vision

You can set/clear switches/counters to keep track of what their vision was before and then perform your action and toggle the switches when it changes.