Am I missing something?

I just looked at the depth chart and did not find a back up DB? No Heyward or such like. Am I to assume that Shannon James
listed at Linebacker would play DB if an injury occurs?

Nope, you’re not missing anything. They did the same last week. The problem is that three of our DBs are injured. So we really don’t have any more backups. And like last week (and the week before, actually, after the last two were injured in that game), both James and Beswick can be put in at DB. In an absolute emergency (knock wood), I’m guessing that Knowlton could be moved back as well.