Opportunities always favor those who are prepared.
Fang Zheng didn't wait long in the asteroid belt before he saw the Shield World's gate open once again, following which a few Star Alliance warships emerged. They seemed to be patrolling as they circled around the Shield World—it made sense considering that the Missionary's warship had been attacked by Elizabeth and wasn't fully repaired yet. Naturally, the Missionary was concerned about Fang Zheng bringing a fleet to block the gate.
So the best strategy was to send scouts to watch the situation outside, just in case Fang Zheng really did come with reinforcements, allowing the Missionary to make a quick escape...
In fact, the Missionary's guess was correct; Fang Zheng indeed came, just without any reinforcements.
However, since he was there, Fang Zheng had no intention of leaving empty-handed.