First add a guard.
Now add a 04XX action block, and attach the guard to it. Make sure you click on him to determine what guard ID he’s been assigned.
For fun lets only have him disappear when he’s spotted Bond. That’s return value loop command 32, and it keeps looping till it’s true. Then it eliminates the current guard because of FD, using the 23 command, and exits the routine. If you want, you can do this in a 10XX block or anywhere. If you want to use the guard fade instead, command 23, it must be in a 04XX block.
Now you see him
Now you don’t