Of course, there could be other “past sins” that are catching up with Norman Nordstrom, as Don’t Breathe 2’s protagonist was a pretty vicious dude when he wanted to be.
Someone could have been wronged before, or after, Don’t Breathe’s chain of events.
There’s even a possibility that the parents of Cindy, the woman who killed Norman’s daughter, may have found out that he was her captor.
As such, those peaceful days could be coming to an end, as the cycle of parental revenge puts Stephen Lang on the other side of the table.