Peter Jackson: more grim head games as too many players ignore tackle height consequences 

Edinburgh’s Viliame Mata is tackled by Jamie George of Saracens. Picture: INPHO/Craig Watson

Owen Farrell can expect some familiar company at Tackle School any day soon after another weekend of head-banging and conflicting messages on concussion.

In the course of reaffiriming Leinster’s status as undisputed No.1 seeds, completion of the Champions’ Cup pool stage raised two questions every bit as disturbing as some of the images: How many more players must be exposed to the risk of brain damage?