What’s he trying to do when he edges that to whoever was at mid-silly-leg-side-slip-on-loafers and what’s he done wrong/the bowler done right?
In all honesty, not an awful lot wrong. It’s a good length ball (one that is too short to reach out to and smother, but too long to step back to and wait for) and was threatening to hit the top of off stump which is commonly recognised as the ideal line. Overton’s doing the right thing to use a dead bat to block it.
Then as noted above, the ball has deviated slightly and as a result instead of hitting the middle, has hit the edge. Perhaps also bounced a bit more than expected which just happens sometimes, can happen when the pitch becomes worn and uneven, or may as above indicate a little more effort (side note, they say effort but if that comes from the shoulder and arm then usually batsmen can spot it, almost subconsciously) It’s when the bowler gives a bit more wrist that the action looks the same but it catches people out – Archer does this well which is why he regularly hits people.
Do differently? If you watch it through he just pushes his hands and bat towards the ball rather than wait for it, some batters have ‘soft’ hands so even if it finds the edge the ball doesn’t carry as well. Have better hand eye coordination to have a better chance of it still finding the middle? Or even be worse / luckier and miss it completely. I don’t think he could reasonably have left it alone, in hindsight the bounce and movement means it wouldn’t have hit the stumps but you can’t play for that, or if you do then pretty soon you’ll be out bowled or LBW not playing a shot and look a bigger chump.
Definitely a wicket to the bowler in this case rather than a negative against the batter for me.