Normally it should have worked, unless if you saved Rohan. If you did, the Guardian will leave the prison to go after him, thinking he has escaped. If you don't do anything at all, he'll come and fuck Anthony in front of you. Did you save Rohan ?
Yeah, I figured that out... but it seems the Guardian takes control of Anthony immediately, so there's no opportunity to interact with him afterwards. (Except for some reason, if you're *not* there to watch it, it will *say* that Anthony's body was taken -- even though you have no way of knowing that without having been there -- but he's still just lying there untouched. Pretty sure that part is a bug.)