Passmoor's first game back in charge brought a 3-0 win against a Reading side which Grainger's team had beaten away from home earlier in the season.
The result lifted Leeds out of the drop zone but Passmoor, who has returned only until the end of the season, had a sympathetic word for his former management colleague.
"Gemma had done a great job with the reserves," he said, "and taking on the first team with a largely inexperienced group of players at this level was a difficult task.
"I've simply said that I'll come in and hold the fort until the end of the season with the aim of keeping the team in the Premier League."
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