Replying 4 years late but better late than never, right? 😂
Took me a while to figure out that level as well. You can influence how the inactive AI moves. It always looks at the mouse cursor and walks in that direction when you press Space.
You can use that to make it bounce back and forth in a safe space. Then you can use the yellow box to block the two guards on the right and get the suitcase.
I'm really not a fan of that game mechanic, though. Not sure what the point is.
