Don't blame the rt for this one, that's on Bradford, 100%. The protection is correct, not sliding to account for the showing mlb. The rt picks up the most immediate threat. Sam has got to 1) realize that the blitzing backer may be coming free because of the formation and blocking scheme and then 2) go to his hot/throw it away/run/anything but stand there. It's a zone blitz that he's had to have seen a hundred times, no excuses.
EDIT: That's a safety showing, not the mlb.
EDIT2: If you have the full screen, I'd be interested to see what the TE does. He should break off his route because his man is the blitzer and be the hot.