Explaining the Colts' decision to waive-injure running back Boom Herron

Scott Kane-USA TODAY SportsThe Indianapolis Colts waived-injured running back Boom Herron, which confused many. We attempt to clarify it a bit for you.

When Boom Herron was waived-injured by the Indianapolis Colts on Sunday, it sparked a number of questions (and criticisms) from fans about what was going on. Why didn't they just place him straight to injured reserve? Why was he in the preseason game to begin with?

According to NFL Media's Ian Rapoport, Boom Herron suffered a sprained AC joint in Thursday's preseason game when he was returning a kickoff - an injury described as a "minor setback." So what we have is a minor injury for Herron but one that will still cause him to miss a bit of…