Barnsley remain just outside the Championship drop zone despite matching West Brom in an entertaining draw.
Koumas showed his quality with a stunning opening goal
West Brom's Jason Koumas opened the scoring when he received Nigel Quashie's pass at pace and fired a shot beyond Nick Colgan after 30 minutes.
Barnsley levelled the score before the break as Paul Hayes scrambled home when Russell Hoult was out of his goal.
West Brom pressed forward but Colgan thwarted the best efforts from John Hartson and Nathan Ellington.
The visitors had allowed themselves to be battered by Barnsley in the opening stages before some creative play from full-back Martin Albrechtsen finally woke them up.
Albrechtsen wriggled his way past three defenders before Bobby Hassell thumped away his attempted cross.
The Dane then sent another dangerous cross into the box but was unlucky to just miss Hartson, who threw up his hands in despair as the ball flew harmlessly wide.
A period of frantic, exciting play led to Hoult making a series of quick saves to keep Barnsley at bay.
But it was West Brom who broke the deadlock when Quashie played an excellent pass to Koumas as he hit his stride down the left wing.
The Wales international received the ball, rocked back and sent a fizzing, left-footed shot past Colgan.
Barnsley found their answer five minutes later after a period of barn-storming pressure left Hoult flat on his back as he was toppled over by diminutive on-loan striker Leon Knight.
The loose ball fell first to Daniel Nardiello but his shot was cleared off the line before Hayes pounced to bundle in the leveller.
West Brom almost got off to a perfect start after the break but an alert Colgan turned Hartson's right-footed smash on to the bar and then saved Kevin Phillips' follow-up with his legs.
While the visitors tried to spring an early attack, Barnsley sought to profit from set-pieces.
Knight got on to the end of Kyel Reid's free-kick but glanced his header wide, while Hassell also missed the target when he rose for Brian Howard's corner.
Koumas then tested Colgan with another piledriver but this time he safely pushed it over the bar.
It was enough for Baggies boss Tony Mowbray to make a change and send on Ellington in a three-pronged attack alongside Hartson and Phillips.
Hartson twice hit the woodwork before he was hauled off, while Phillips went close when his fierce drive was turned away by Colgan.
Barnsley had the Irish stopper to thank again when he scrambled to smother Ellington's powerful effort and save the point.
Meanwhile, Barnsley fans sent their wishes to Ronnie Wallwork, on loan at Oakwell from West Brom, by displaying a banner round the pitch reading "Get well soon Ronnie."
Wallwork has been released from hospital after being stabbed in a Manchester Bar just over a week ago.
Barnsley caretaker-manager Simon Davey:
"I felt we could have won the game. They controlled parts of the game but we had the better chances.
"West Brom played well because they are Premiership-quality players."
Davey reiterated that he would not officially apply for the manager's post saying: "If you're picking up results then I don't need to send in my application."
West Brom manager Tony Mowbray:
"We've got to find consistency to win matches on a regular basis.
"We find ourselves on the same points as a lot of other sides who will tell you the same.
"For parts of the second half only one team was going to win it. I think there were plenty of opportunities for us but it just didn't happen."
Barnsley: Colgan, Austin, Paul Reid, Hassell, Heckingbottom, Hayes, Togwell, Howard, Kyle Reid (Devaney 72), Knight (Richards 75), Nardiello.
Subs Not Used: Letheren, Williams, McCann.
Goals: Hayes 35.
West Brom: Hoult, Albrechtsen, Davies, McShane (Clement 63), Robinson, Koumas, Greening, Quashie, Gera (Ellington 67), Hartson (Carter 76), Phillips.
Subs Not Used: Steele, Hodgkiss.
Booked: McShane, Koumas.
Goals: Koumas 30.
Ref: A Bates (Staffordshire).