Ok so as described in the rule book if two characters are standing adjacent to each other on diagonals the space between them blocks line of fire. So heres the situation there are four figs stacked up together like so...

XO
OX

the X are my figs and the O is my opponent, now say one of my figs has probability control of which I want to target my other fig, but because my opponents are adjacent on diagonals am I still able to Prob my other fig since Prob needs line of fire? Does it work the same way as being adjacent to a character in stealth but being unable to outwit them because of line of fire??

No you can't, if he was an enemy ou could puunch him in the face but not see him. Makes sense right?

The two opposing characters block line of fire from one friendly character to the other. Also, the two friendly characters block line of fire from one opposing character to the other. You would not be able to use Probability Control from one friendly character to the other.

It makes no sense, but it's true.