Former Leinsterman Ross Molony leaves the pitch and gets a nice hand from the Aviva Stadium.

He's off for no more than a minute as Charlie Ewels requires an HIA.

Leinster don't make much headway off the set-piece and Ross Byrne, who is on for Prendergast, knocks a crossfield kick for Barrett but the All Black has to check his stride and is forced into touch.

The bouncing ball causes problems in the Bath backfield and De Glanville is forced to carry it over his own line.

He's then nailed by Hugo Keenan and Leinster have the scrum on the five metre line.

Another penalty to Leinster at the scrum and it's a second yellow for Beno Obano as well.

That's a huge blow to Bath, a real game-changing card.

Image source, Inpho

Prendergast and Ringrose combine to dislodge the ball from Barbeary but Bath have the penalty advantage.

Oh...that's not one you see every day. Bath forget the tap of the tap and go penalty.

Leinster will have the scrum in the shadow of their own posts.

Leinster have gotten a huge lift from their bench.

Snyman with the score but Caelan Doris has been busy too.

Bath are on the attack now, though.

And here comes Du Toit who is on for Will Stuart.

Charlie Ewels arrives as well, taking the place of Quinn Roux, another former Leinsterman in Bath's ranks.

Nothing comes from line-out and Leinster are back in possession.

Bath look to be readying a replacement with tight-head Du Toit ready to come on.

How's your luck Finn Russell?

He looks disgusted with his kick that looks to be going dead but it bounces back off the padding around the posts and Hugo Keenan has to simply gather and kick to touch.

Line-out to Bath...

Caelan Doris' first involvement is a big carry through the middle.

Leinster just getting a bit more traction here in the second half.

Here come the reinforcements for Leinster.

Springbok RG Synman is on for James Ryan, while Irish skipper Caelan Doris takes the place of Max Deegan.

How about being able to bring those two off the bench?

There's a fair amount of intent to how Leinster have started this half, a sharpness in attack they've been accused of lacking at times this year.

Bath have been defending well, though, and here comes Obano to return them to a full complement.

Jamison Gibson-Park returns from his HIA and Luke McGrath goes back to the bench.

Image source, Inpho

A reminder that Bath will still be down to 14 for the first three minutes or so of this second half

And we're back underway in Dublin...the second 40 can't be as good as the first - can it?

With 40 minutes remaining in Pool 2, Leinster trail Bath at home but would still top the group.

That's because La Rochelle are behind against Benetton.

This combination of results would be bad news for Clermont who, if things stay the same, will fall into the Challenge Cup despite their last-gasp win over Bristol earlier.

Image source, Inpho

Russell's conversion of Tom de Glanville's try was the last action of the half and the teams head for the sheds after 40 minutes of hugely entertaining fare.

The visitors stormed from the blocks with two early tries only for Leinster to come back and seemingly right the ship before half-time.

But even with Beno Obano in the bin, there was time just before the break for Bath to strike again with what was the pick of the first-half's six tries.

More of the same after the break please!