Valerien Ismael enjoyed a winning home debut at The Hawthorns as his West Brom side survived a late scare to beat Luton Town.
The Hatters came back into the game from 3-0 down after being stung into life by the incident that led to Luton midfielder Jordan Clark being carried off.
Clark left the pitch on a stretcher after a long delay, following an aerial challenge by England keeper Sam Johnstone.
The visitors then scored twice, first through Harry Cornick and then from Pelly-Ruddock Mpanzu eight minutes into the 16 minutes of stoppage time added by referee Tim Robinson.