The Tennessee Titans injury news out of Thursday is the kind camp coaches dread in late August: receiver Wan'Dale Robinson is being evaluated for a concussion after taking a big hit from Bears safety Xavier Woods during joint practice. No game, no scoreboard, no down and distance. Just two teams sharing a field and one collision that changed the temperature of the whole afternoon.

The word attached to the hit, and it traveled fast, was "cheap." That is a loaded word in a joint practice. It is also the word that turns a football play into a two-team argument in about four seconds.

What happened to Wan'Dale Robinson

Here is what I actually have, and I am not going to dress it up past that: Robinson took the hit from Woods, and he entered evaluation for a concussion. Evaluation is not a diagnosis. The protocol exists precisely so nobody has to eyeball it and guess, and the honest answer today is that the protocol has its own clock and it does not consult anybody's depth chart.

Robinson is a slot receiver by trade, a volume guy, the sort who lives in the middle of the field where safeties get to hunt. That is the job. It is also why the middle of the field is where these moments happen, over and over, every August, in every camp in the league.

Why joint practices keep producing this

Joint practices are the best invention in modern camp and the most combustible. You get better work than any preseason snap: real speed, real schemes, opponents who have not spent four weeks memorizing your tells. What you do not get is a scoreboard telling anybody when to stop.

So the unwritten rules do the governing. Do not cut the quarterback. Do not put a receiver on the ground when he is stretched out and defenseless. Everybody knows them. Everybody bends them a little when the pads have been on for a month and the temper is short.

checked the almanac: the league has had independent neurotrauma consultants on NFL sidelines since 2013, and camp medicine has caught up plenty since. the etiquette of a padded joint session is still enforced by nothing but two coaching staffs and whoever gets there first.

That is not a scandal. It is just the trade. Teams accept a small amount of chaos in exchange for the best practice reps they will get all year, and every so often the chaos collects on somebody.

What comes next for Tennessee and Chicago

For the Titans, the sequence is the boring one, which is the correct one. Robinson goes through the protocol. He clears it or he does not, on the schedule his brain sets, not the one the calendar wants. Anything I told you beyond that would be me making it up, and I do not do that.

For the Bears, Woods is a veteran safety who has made a career out of arriving. Whether that hit gets a second look from anyone beyond the two sidelines, I do not know yet, and I would rather say so than guess. The reporting available is thin, one line and one adjective.

What I am watching next is simple: whether Tennessee puts a formal designation on Robinson, and whether the two staffs say anything about how the rest of that session went after the hit. Joint practices have a way of getting shorter once the word "cheap" is in the air.