The one past sideline slip concussion was a fluke; but proper technique will reduce Shield's risk of concussion close to zero. The guy is a CB for cripes sake.
Every year we hear, "back to basics...Fundamental football."
Well, how about if someone teaches Shields how to tackle; he leads with his head all the time when he is crashing from the side. I suspect his Jax "concussion" was his second in that game. And one day; he'll hurt his neck.
On the Yeldon TD, Shields was running parallel to LOS and stuck his head out in the path of Yeldon's thigh as he laid out, the thigh struck Shields' head knocking it toward endzone like he was hitting a croquet ball with a mallet. Shields helicoptered 90 degrees from the blow to his head. Shields looked up to see the TD, then he put his head on ground facemask first for a couple of seconds. Could have been disappointment the TD occurred; but I bet he got his bell rung there too.
When Shields is crashing from the side to fill the B or C gap; he MUST keep his head up. If he doesn't, bench him for a series to drive the concept home. We must have Shields, Randall, Daniels and CM3 for the Playoffs.