Leinster were up against returning Welsh first liners and were beaten at the breakdown and in aerial kicking combat.

Alun Wyn Jones and his back row team won the day by being seriously good at the break down area all evening. Whether they were picking and going directly with their own ball to negate the Leinster counter ruck, turning over the ball themselves again and again at ruck time or with the choke tackle which they used multiple times in both have, they seem to come out on top of each tussle.

I was a little annoyed with referee, John Lacey, about a certain ruling he gave for a choke tackle on a Leinster player that just fielded a kick. He gave the decision the wrong way in the first half, awarding the scrum to the Ospreys. The same thing happened in the second half, but the Leinster players were straight up to him and he reversed the decision. The dressing room staff obviously teaching a few of the rules at half time.

There was no other reason to get at the referee; he was consistent throughout in his annoying way. Leinster threw this game away.

They started brightly, scoring a penalty, but gave away the first try after losing a shockingly bad kicking battle.

They had possession in the form of a scrum in their own half, Luke McGrath took it down the side with only himself and Fergus McFadden. The winger kicked down field - I struggle to understand what this was supposed to achieve, as the defending winger dealt with it easily.

The kick was returned with interest and in the back and forth Leinster first lost ground and then possession as Biggar collected his own up-and-under. A nice try followed in the corner.

That got the home side rolling. Their next try was almost like total rugby with the forwards moving forward with every touch before letting the ball out the back. Dan Evans got in for a brace in the same corner.

Leinster looked beaten. Their back line had to undergo lots of early changes, with McFadden being taken off for a head injury assessment, Dave Kearney replaced not long after he had replaced Noel Reid. Jamison Gibson-Park came on earlier than expected and played on the wing.

That doesn’t explain the loss, the bullying up front was what won the day for the Ospreys. When they scored their third try it looked like the writing was on the wall for Leinster.

Thankfully they kept their hopes and the game alive into the second half with score from a Cronin kick through into the corner. The television match official had to check that Daly did not have his foot in touch when touching it down. The crowd was probably justified in booing the decision - one for the rule makers to review.

Leinster had several Irish Grand Slam players in their lineup, albeit bench players. Sean Cronin was perhaps the pick of the bunch. Joey Carberry looked like a player who has not had enough game time this year. I’d find it hard to argue for his inclusion in the first fifteen for next week’s show down with Saracens.

The second half was pretty similar to the first, with the choke tackle on Leinster’s lightweight backs a recurring theme. When the home side scored early on, a quick Leinster response meant they stayed in the chase, Rory O’Laughlin scoring one of their best moves all game.

The scattered crowd raised the loudest cheer for the Ospreys as Tipuric scored a try to gain them the bonus point. By that stage all the boys in blue were doing was chasing a losing bonus point. But even that was all in vain. The game finished 32-18.

The Six Nations period challenges all teams in all leagues. Integrating the international players back into the squad in time for the European Quarter Finals is tough, and the lack of regular games for Leinster means that the rest of the squad are a little stale.

Still we look forward to the likes of Sexton, Toner, Ringrose, Kearney, Furlong and more coming back next week for the biggest game of the year to date. This was just an appetiser, leaving us still hungry for more.