Andre continued to gather his people; the fight with Djo Malthael wasn't a battle that could be finished in a day, nor was gathering manpower a task that could be completed quickly.
As for Gao Yang, he temporarily had nothing to do. The five An-32 planes needed to fly to Somalia, but this required finding pilots and waiting for Andre to gather the team, as well as clearing the way, which couldn't be done in just a couple of days.
Since there wasn't much to do, Gao Yang decided to take justice into his own hands.
When the tree falls, the monkeys scatter. Mogilevich was dead, and his underlings would either take over and continue fighting or flee quickly, so whatever was to be done, needed to be done immediately.
Gao Yang didn't expect to capture all of Mogilevich's men at once, but he had to try. There might be fools waiting to be taken down; after all, there's no shortage of people who fail to see the situation clearly.
