This time its triggers. Now I need to know this.

How do I make say for example a critter like a bengaless form a barrier around a unit and hold position in a create move trigger.

BBB B=Bengal
BOB O=Unit
BBB

But to save time I want to make sure every time it captures a unit around any unit like an scv or probe without being specific like...
BBB
O -> BOB
BBB

Does it have to be a critter? Using powerups would work better, and it'd be easier.

If you just want a bunch of benglaas around a unit always teleport them to the unit.
Maybe using hypertriggers will improve reliability.

No, he wants them set up with a mobile grid.