Malakaus isn't aware that Sarel is present. As far as he knows, Sarel and Serge should still be in the city, doing whatever business it was he told Malakaus they'd be doing. Malakaus doesn't mind doing his work, so long as it means that he gets to be in control. If you'd like Sarel to resume his job, just have him find Malakaus and I can have him find something else to do. Probably involving fisticuffs. Do you think they'd have schools of martial arts like Goutfang, Whispering Fang and Rawlith Khaj in Khenarthi's Roost?