Keinan Davis pushed West Brom closer to the drop after his late leveller denied the Baggies a derby win at Aston Villa.
The striker's injury-time goal - after Kyle Bartley's mistake - earned Villa a 2-2 draw to stop Albion claiming another priceless victory.
Time is running out and the second-bottom Baggies are nine points from Premier League safety with five games left.
Tyrone Mings' own goal looked like earning Sam Allardyce's side a third win in four games after Matheus Pereira's penalty had cancelled out Anwar El Ghazi's spot-kick.