Manager Tony Pulis admitted it was "hard to take" after his West Brom side suffered a late derby defeat to Aston Villa at Villa Park.
Christian Benteke struck a last-gasp penalty as Villa halted a seven-match losing run in the Premier League with a 2-1 win and hand Villa boss Tim Sherwood his first victory in charge.
Villa took the lead through Gabriel Agbonlahor's 22nd-minute strike but the visitors levelled after 67 minutes as Saido Berahino scored his 18th goal of the season.
However, it was the hosts who claimed the spoils as West Brom goalkeeper Ben Foster conceded a last-minute penalty for bringing down Matthew Lowton and Benteke made no mistake as he coolly slotted low into the bottom corner.
Pulis told BT Sport 1: "Obviously Ben will be disappointed with what happened. We scrapped away.
"First half I thought they were better than us, they were quicker to the ball and they looked the better team first half. Second half we got more into it and they had a couple of long-range shots and at the end it was a mistake, so it's very disappointing and hard to take."
The defeat leaves West Brom seven points above the relegation zone and Pulis added: "We dug in in the second half and we got the goal. Maybe we would have liked to chance one or two things but we haven't got people fit at the moment so we got on with what we have.
"One or two looked a little bit leggy today but having said that they have been absolutely magnificent the team and worked very, very hard and to lose a game like that is very disappointing."
West Brom's manager said he wouldn't have to set aside time to berate Foster for his error.
Pulis said: "I haven't seen it but Ben should catch it anyway. He has been fantastic for us all season, he has won us games and he has had an off night, but there'll be no one here who will criticise him.
"I don't have to speak him, he knows. We'll dust ourselves off and get going on Thursday."
Pulis also played down Alan Hutton's challenge on Berahino which saw the pair square up to each other late in the game.
He said: "I haven't seen the Hutton challenge. There has been a lot of criticism thrown at referees recently but I'm not going to go there. I'll let other people decide what they thought about it.
"The most important thing was Villa were better than us in the first half. They were quicker, kept the ball better and we wanted half-time. The second half was a different game."
