Kanoth Ghost
Below are my impressively bad examples of the Kanoth Ghost/aberration's that pop up at 47% and again around 25-30%. The general rule to follow is to stay away from the ones with the purple circle under them and out of the front of the ones with the purple circle in front of them.
The above is a live action screen shot of the ghost phase. In this set up, behind either ghost with the purple circle in front of them is safe.