The second Ashes Test on Saturday witnessed an engrossing passage of play where the in-form Australian Steven Smith was severely tested by English debutant Jofra Archer with some hostile fast bowling. Smith was first hit on the elbow, and later on a soft spot at the back of his head. He had to be taken off the field for a mandated concussion test.

Surprisingly, he was deemed fit by both Cricket Australia and the International Cricket Council, and walked in to bat within an hour. (Experts say concussion symptoms may appear up to 36 hours, or even days, of a blow to the head.) While a lot of talk around the incident centred on the gladiatorial nature of the contest and Smith's courage, it was hard to escape the memories of 2014, when a similar blow to the back of the head resulted in the death of Australian Phil Hughes.