These demons weren't really fighters. Brawlers and guards, but not fighters. Lucifer was not willing to devote his own troops to this. They weren't as replaceable as these ones were.
Their job was to stall for their master. The one who had gotten away was already placing the call.
The demons gave one another a look, then split up into two groups, one going after the female and the other after the male. They were more concerned about keeping themselves alive, and putting up a token defense until Lucifer arrived then anything else.