But he was desperate to get some game time ahead of England's opening autumn international against New Zealand next Saturday and came through despite a cut to the head which needed treatment.
Moody had hoped to help his Bath side secure a first victory in six attempts at the Twickenham Stoop.
But even his enthusiastic display could not inspire his team-mates in a match which offered plenty of effort but little in the way of quality.
Quins made the more promising start and Evans collected his own chip to launch a surge forward but Tom Williams failed to hold on to the final pass.
Evans then missed a simple penalty attempt before Barkley landed a penalty from inside his own half to put the visitors ahead.
Moody had to leave the field after five minutes with a cut
The lively Evans then cut a brilliant line off scrum-half Karl Dickson but he failed to hold the pass and a certain try went begging.
Barkley also missed a simple penalty and Bath's Sam Vesty was halted by Mike Brown after a fine break.
But a second Barkley kick put Bath 6-0 ahead only for two Evans kicks in the space of five minutes to level the scores.
And although both sides searched for a winning score in the closing stages, neither team could fashion an opportunity.
Bath and England flanker Lewis Moody: "I was a bit nervous going into the game that I would not pick the ball up as quickly but it was fine. Even in the dwindling light conditions it did not affect me.
"There was a very similar situation where the guy was lining up the kick and I didn't hold back in going to charge him down. That was a good mental thing.
"The eye's all right - it was a case of getting my eye in, so to speak.
"I just wanted to get out and play. I've had three or four weeks without a game and that's never good for a player, it's frustrating.
"Having three or four weeks off is not ideal for your fitness but I was really happy to be on the field at the end."
Harlequins director of rugby Conor O'Shea: "I thought both teams tried to play a lot of rugby. The fact there were no tries does not make it a shocking spectacle.
"I thought on the balance of play we deserved to win."
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