Lancelot didn't get any valuable new intelligence from these survivors, but they did like the idea of seeking refuge in the Temple of Lord Wu'an. The group dealt with the enemy corpses in a rudimentary way, slightly concealing the traces of battle, and then hurriedly left.
The size of the team had doubled in an instant, naturally increasing the risk of being discovered, but the situation Lancelot was worried about did not occur. The Hell Generals probably believed that the massacre had eliminated most of the threat and that one or two fish slipping through the net were not to be feared. Furthermore, with the Demon coalition army outside the city looking poised for a strong offensive, they had pulled all their forces to block the city gates.