Its hard telling whats going to happen in these situations, but I think that its super important for you to have a plan of what to say IF you get the chance.
I think that if you do get into a discussion about why you went to the SGT, I would be honest, you did it to plan for the security of the family. He may be mad, but YOU are not the one who did the bad thing here. Its like getting mad at the cop for giving you a speeding ticket. Hes not mad because you told on him, hes mad because he got caught.
I guess I gave the wrong finger to the wrong man...