Josh Key finds another smart pass to a Swans teammate in the box.

This time it's Liam Cullen, but the forward lifts his strike too high.

Time running low to try and claw back the deficit before the break.

Steve Ogrizovic
Ex-Coventry City goalkeeper on BBC CWR

We have got that third goal of the game!

If you get space down the wings, you have to play quickly and pull it back for a midfielder.

That's exactly what happened there, great from Eccles, he got his head down and put it away.

Sinclair Armstrong is alone in the box but Swansea defender Cameron Burgess stands in his way to prevent the block.

Conceding a third so shortly after missing a chance on the counter would have been extra demoralising for the visitors.

Just five minutes of the first half remains in this one, and Southampton make it clear that they want more goals.

Saints play it calmly out from the back, and in a flash are threatening on the edge of Charlton's penalty area.

Tom Fellows has an effort blocked, and moments later Adam Armstrong curls a shot wide.

Milan Van Ewijk goes for the spectacular from the edge of the area for Coventry but it's miles off target.

The home side have got a lot of thinking to do.

Swansea get the chance to break and Adam Idah carries it all the way to the box but Liam Cullen hasn't travelled as quickly.

Idah has two choices - to take it on himself or cut it across in the hope Cullen gets there.

He tries the latter but no dice. It's not reaching Cullen and the attack is wasted.

It's a massive scramble in the West Brom six-yard area and from point-blank range Josh Griffiths blocks Josh Eccles' volley.

Heads in hands all around the Coventry side - should have scored surely, but wonderful goalkeeping.

Dafydd Pritchard
BBC Sport Wales at Ashton Gate

Just as Swansea seemed to be getting a foothold in the game and starting to create chances, they shoot themselves in the foot.

Ronald gave the ball away needlessly to Emil Riis with a no-look back-pass and, although Cameron Burgess saved his blushes with a goal-line clearance on that occasion, the Swans could not navigate that period of pressure and they find themselves two down.

If Vitor Matos is here by now, he'll be concerned by what he's seeing.

With Southampton doing a demolition job on Charlton right now, I wonder how long Saints' interim boss Tonda Eckert will actually only be an 'interim boss'.

Surely the few wins he oversaw before the international break and this performance so far is a good reason to give him the job full time?

What do you think Saints fans?

Tony Brown
West Brom's all-time record scorer on BBC Radio WM

Identical, same ball put in, same finish from Heggebo, absolutely brilliant.

The confidence he got from his goal last week, now he's going after everything, he's getting into the box for everything and he's got another.

West Brom have got to concentrate now, they can't let Coventry back into the game, get the clean sheet, get the three points.

Just as I was saying Swansea were having a better look, Bristol City go and prove me wrong.

A sloppy back pass is pounced on by Emil Riis and set off for Sinclair Armstrong.

With Lawrence Vigouroux off his line, Armstrong puts it past the keeper but sees it cleared before reaching the line by Cameron Burgess.

I'd suggest he probably doesn't want to right now.

We have just passed the half-hour mark at The Valley.

Eight minutes have passed since the last goal...

And eight minutes is all it took for Saints to hit their four goals.

Jayson Molumby takes out Ephron Mason-Clark because he wants Coventry to put the ball out with Mikey Johnston down injured.

It's getting a little feisty.

Molumby is carded and so is Mason-Clark for his reaction.

Before this game kicked off, Charlton were the ones riding high in the Championship compared to Southampton.

They started the day ninth in the table and nine places about Saints.

Right now, Southampton look irresistible while Charlton have simply been bamboozled.